Pub Date : 2025-10-10DOI: 10.1016/j.physc.2025.1354790
Quansheng Sun , Chunyan Cui , Xinning Hu , Xian Yi , Yuan Zhang , Feifei Niu , Qiuliang Wang
The superconducting rotor magnetic levitation system has great potential in high-precision angular velocity sensing, but its accuracy and stability are limited by the coupling of multiple physical fields. To address the unresolved synergistic interaction between axial mass eccentricity and aspheric factors, this study systematically quantifies how material heterogeneity affects axial mass eccentricity. On this basis, a multi-field coupling dynamic model of superconducting rotor is established, and the dynamic characteristics of polar axis offset under the single action of axial mass eccentricity and its synergistic effect with aspheric factors such as centrifugal deformation are deeply analyzed, and quantitatively characterizes the nonlinear increase in drift velocity arising from their coupling. The results show that axial mass eccentricity is the core interference source of polar axis drift. The proposed quantitative models of material-induced eccentricity and its coupling with deformation offer a new theoretical foundation for drift prediction, compensation control, and structural optimization of high-precision superconducting rotors.
{"title":"Analysis of the influence of axial mass eccentricity on polar axis offset characteristics in superconducting rotors of magnetic levitation system","authors":"Quansheng Sun , Chunyan Cui , Xinning Hu , Xian Yi , Yuan Zhang , Feifei Niu , Qiuliang Wang","doi":"10.1016/j.physc.2025.1354790","DOIUrl":"10.1016/j.physc.2025.1354790","url":null,"abstract":"<div><div>The superconducting rotor magnetic levitation system has great potential in high-precision angular velocity sensing, but its accuracy and stability are limited by the coupling of multiple physical fields. To address the unresolved synergistic interaction between axial mass eccentricity and aspheric factors, this study systematically quantifies how material heterogeneity affects axial mass eccentricity. On this basis, a multi-field coupling dynamic model of superconducting rotor is established, and the dynamic characteristics of polar axis offset under the single action of axial mass eccentricity and its synergistic effect with aspheric factors such as centrifugal deformation are deeply analyzed, and quantitatively characterizes the nonlinear increase in drift velocity arising from their coupling. The results show that axial mass eccentricity is the core interference source of polar axis drift. The proposed quantitative models of material-induced eccentricity and its coupling with deformation offer a new theoretical foundation for drift prediction, compensation control, and structural optimization of high-precision superconducting rotors.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"638 ","pages":"Article 1354790"},"PeriodicalIF":1.0,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145269172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-10-09DOI: 10.1016/j.physc.2025.1354803
Long Qian , Wen-Guang Li , Jin-Yan Li , Pei-Chao Li , Zheng-Tang Liu , Qi-Jun Liu
First-principles calculations were performed to investigate the electronic properties of HgBa2Ca2Cu3O8 (Hg-1223) under applied pressures ranging from 0 to 15 GPa and oxygen doping levels (δ) varying from 0 to 0.5. Under pressure, strengthened Cu-O bonding within the CuO2 planes and weakened interlayer coupling result in carriers being predominantly confined to the CuO2 layers, reflecting the inherent two-dimensional nature of the electronic structure in Hg-1223. The introduction of oxygen at the O(4) site increases the density of states (DOS) at the Fermi level and enhances interatomic interactions, leading to a significant increase in hole concentration within the CuO2 layers. A characteristic peak was observed in the O(4) DOS near the Fermi level in doped supercells; accordingly, an optimal oxygen doping concentration, δO, was defined. Based on the computational results, we propose an optimal δO range for Hg-1223 of 0.35 < δO < 0.45.
{"title":"Comprehensive analysis of pressure and oxygen doping on the structure and electronic properties of HgBa2Ca2Cu3O8 superconductor","authors":"Long Qian , Wen-Guang Li , Jin-Yan Li , Pei-Chao Li , Zheng-Tang Liu , Qi-Jun Liu","doi":"10.1016/j.physc.2025.1354803","DOIUrl":"10.1016/j.physc.2025.1354803","url":null,"abstract":"<div><div>First-principles calculations were performed to investigate the electronic properties of HgBa<sub>2</sub>Ca<sub>2</sub>Cu<sub>3</sub>O<sub>8</sub> (Hg-1223) under applied pressures ranging from 0 to 15 GPa and oxygen doping levels (<em>δ</em>) varying from 0 to 0.5. Under pressure, strengthened Cu-O bonding within the CuO<sub>2</sub> planes and weakened interlayer coupling result in carriers being predominantly confined to the CuO<sub>2</sub> layers, reflecting the inherent two-dimensional nature of the electronic structure in Hg-1223. The introduction of oxygen at the O(4) site increases the density of states (DOS) at the Fermi level and enhances interatomic interactions, leading to a significant increase in hole concentration within the CuO<sub>2</sub> layers. A characteristic peak was observed in the O(4) DOS near the Fermi level in doped supercells; accordingly, an optimal oxygen doping concentration, <em>δ</em><sub>O</sub>, was defined. Based on the computational results, we propose an optimal <em>δ</em><sub>O</sub> range for Hg-1223 of 0.35 < <em>δ</em><sub>O</sub> < 0.45.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"639 ","pages":"Article 1354803"},"PeriodicalIF":1.0,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-25DOI: 10.1016/j.physc.2025.1354801
Weifeng Pan , Jun Zheng , Yonghai Zhao , Le Xu
The high-temperature superconducting (HTS) pinning magnetic levitation (maglev) system achieves passive and stable levitation through the coupling between HTS bulks and permanent magnet guideway (PMG), which gives it great development potential in the field of high-speed rail transit. Nevertheless, safety considerations are also crucial for the HTS maglev transportation system. Currently, there is a lack of research on the operational safety of HTS maglev trains during some extreme situation like earthquakes. Thus, this paper uses an experimentally-verified electromagnetic-thermal-mechanical model to simulate and study the variation law of the temperature rise of HTS bulks under the action of the Trinidad seismic waves (including the individual actions of longitudinal waves and transverse waves, as well as their combined action). The results show that a temperature rise of approximately 0.09 K occurs in the left and right bulk materials when longitudinal waves act alone. The comprehensive effect will cause a lateral drift of 0.6 mm. When transverse waves act alone, the temperature rise of the left and right bulks reaches 0.15 K. Compared with vertical vibration, lateral vibration increases the likelihood of the bulks experiencing a quench, thereby posing a risk of the bulks hitting the PMG. When longitudinal and transverse waves act simultaneously, the temperature rise of the left and right bulks is 0.18 K, which is significantly lower than the 92 K critical temperature for quenching. Thus, under seismic wave conditions, the temperature rise of the bulks in HTS maglev system is extremely small, with a maximum of only 0.18 K. In the existing bath cooling mode of HTS pinning maglev, this temperature rise will not cause HTS bulks to quench. However, it is essential to prevent the decline in levitation performance caused by the change in temperature rise, as this decline may lead to the risk of the bulks hitting the PMG. These findings offer valuable insights into thermal stability, which are beneficial for the future practical implementation of HTS maglev systems.
{"title":"Dynamic response of high-temperature superconducting magnetic levitation under real seismic wave excitation","authors":"Weifeng Pan , Jun Zheng , Yonghai Zhao , Le Xu","doi":"10.1016/j.physc.2025.1354801","DOIUrl":"10.1016/j.physc.2025.1354801","url":null,"abstract":"<div><div>The high-temperature superconducting (HTS) pinning magnetic levitation (maglev) system achieves passive and stable levitation through the coupling between HTS bulks and permanent magnet guideway (PMG), which gives it great development potential in the field of high-speed rail transit. Nevertheless, safety considerations are also crucial for the HTS maglev transportation system. Currently, there is a lack of research on the operational safety of HTS maglev trains during some extreme situation like earthquakes. Thus, this paper uses an experimentally-verified electromagnetic-thermal-mechanical model to simulate and study the variation law of the temperature rise of HTS bulks under the action of the Trinidad seismic waves (including the individual actions of longitudinal waves and transverse waves, as well as their combined action). The results show that a temperature rise of approximately 0.09 K occurs in the left and right bulk materials when longitudinal waves act alone. The comprehensive effect will cause a lateral drift of 0.6 mm. When transverse waves act alone, the temperature rise of the left and right bulks reaches 0.15 K. Compared with vertical vibration, lateral vibration increases the likelihood of the bulks experiencing a quench, thereby posing a risk of the bulks hitting the PMG. When longitudinal and transverse waves act simultaneously, the temperature rise of the left and right bulks is 0.18 K, which is significantly lower than the 92 K critical temperature for quenching. Thus, under seismic wave conditions, the temperature rise of the bulks in HTS maglev system is extremely small, with a maximum of only 0.18 K. In the existing bath cooling mode of HTS pinning maglev, this temperature rise will not cause HTS bulks to quench. However, it is essential to prevent the decline in levitation performance caused by the change in temperature rise, as this decline may lead to the risk of the bulks hitting the PMG. These findings offer valuable insights into thermal stability, which are beneficial for the future practical implementation of HTS maglev systems.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"638 ","pages":"Article 1354801"},"PeriodicalIF":1.0,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-18DOI: 10.1016/j.physc.2025.1354791
A.V. Nikulov
Belief in thermodynamics has forced superconductivity experts to forget basics of thermodynamics due to a contradiction of superconductivity phenomena to laws of thermodynamics. Because of this belief no one drew reader’s attention during many years that the conventional theory of superconductivity contradicts to the second law of thermodynamics. The common belief that the superconducting transition occurs when the free energy of the superconducting state becomes less than of the normal state has provoked a false claim that a power source of a solenoid creates the energy of magnetization rather than of magnetic field. The authors of only a few books on superconductivity, mostly future Nobel prize winners, did not follow this false claim. No one for many years has noticed that the equality of free energies at the superconducting transition in the critical magnetic field cannot be obtained without contradicting the second law of thermodynamics. The Meissner effect violates the second law of thermodynamics because of the negative surplus work performed in the closed Gorter cycle. The desire to avoid contradiction of superconductivity phenomena with the second law of thermodynamics provoked the false thermodynamics of superconductors, contradicting the law of conservation of energy.
{"title":"Belief in thermodynamics has provoked false thermodynamics of superconductors","authors":"A.V. Nikulov","doi":"10.1016/j.physc.2025.1354791","DOIUrl":"10.1016/j.physc.2025.1354791","url":null,"abstract":"<div><div>Belief in thermodynamics has forced superconductivity experts to forget basics of thermodynamics due to a contradiction of superconductivity phenomena to laws of thermodynamics. Because of this belief no one drew reader’s attention during many years that the conventional theory of superconductivity contradicts to the second law of thermodynamics. The common belief that the superconducting transition occurs when the free energy of the superconducting state becomes less than of the normal state has provoked a false claim that a power source of a solenoid creates the energy of magnetization rather than of magnetic field. The authors of only a few books on superconductivity, mostly future Nobel prize winners, did not follow this false claim. No one for many years has noticed that the equality of free energies at the superconducting transition in the critical magnetic field cannot be obtained without contradicting the second law of thermodynamics. The Meissner effect violates the second law of thermodynamics because of the negative surplus work performed in the closed Gorter cycle. The desire to avoid contradiction of superconductivity phenomena with the second law of thermodynamics provoked the false thermodynamics of superconductors, contradicting the law of conservation of energy.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"638 ","pages":"Article 1354791"},"PeriodicalIF":1.0,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145099157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-16DOI: 10.1016/j.physc.2025.1354799
{"title":"Foreword for the special issue of Physica C “Quantum matter” dedicated to Jan Zaanen","authors":"","doi":"10.1016/j.physc.2025.1354799","DOIUrl":"10.1016/j.physc.2025.1354799","url":null,"abstract":"","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"638 ","pages":"Article 1354799"},"PeriodicalIF":1.0,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145269173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-08DOI: 10.1016/j.physc.2025.1354786
Yu Chen , Yanlan Hu , Yezheng Xiao , Qing Yan , Hui Lu , Huaichao Liu , Jilin Zhang , Xinxin Zhu , Qicai Ni
The Central Solenoid Model Coil (CSMC) is a critical component of the China Fusion Engineering Test Reactor (CFETR), responsible for generating a peak magnetic field of up to 12 T This is essential for ensuring the proper operation of the fusion reactor's confinement system. To verify the stable operation of the CSMC magnet, a quench stability analysis is conducted on each coil of the CSMC when the peak magnetic field is reached. This paper provides a detailed study of the magnetic field distribution of the CSMC under the operating current of 47 kA. Additionally, the CryoSoft code THEA is used to estimate the minimum quench energy (MQE) and temperature margin for each coil of the CSMC magnet system under electromagnetic disturbances, corresponding to the maximum magnetic field condition. A comparison of the minimum quench energy and temperature margin of the five coils is made, leading to the identification of the most susceptible coil to quench. Additional analyses further reveal that the disturbance length and its axial location along the cooling channel significantly affect local quench sensitivity.
{"title":"Quench stability simulation of the CFETR CSMC at 47 kA","authors":"Yu Chen , Yanlan Hu , Yezheng Xiao , Qing Yan , Hui Lu , Huaichao Liu , Jilin Zhang , Xinxin Zhu , Qicai Ni","doi":"10.1016/j.physc.2025.1354786","DOIUrl":"10.1016/j.physc.2025.1354786","url":null,"abstract":"<div><div>The Central Solenoid Model Coil (CSMC) is a critical component of the China Fusion Engineering Test Reactor (CFETR), responsible for generating a peak magnetic field of up to 12 T This is essential for ensuring the proper operation of the fusion reactor's confinement system. To verify the stable operation of the CSMC magnet, a quench stability analysis is conducted on each coil of the CSMC when the peak magnetic field is reached. This paper provides a detailed study of the magnetic field distribution of the CSMC under the operating current of 47 kA. Additionally, the CryoSoft code THEA is used to estimate the minimum quench energy (MQE) and temperature margin for each coil of the CSMC magnet system under electromagnetic disturbances, corresponding to the maximum magnetic field condition. A comparison of the minimum quench energy and temperature margin of the five coils is made, leading to the identification of the most susceptible coil to quench. Additional analyses further reveal that the disturbance length and its axial location along the cooling channel significantly affect local quench sensitivity.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"637 ","pages":"Article 1354786"},"PeriodicalIF":1.0,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145010278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-08DOI: 10.1016/j.physc.2025.1354785
Bingxu Su , Wenhai Zhou , Wei Liu , Rongli Jia , Nipeng Wang , Tingliang Chen , Rui Liang
Numerical calculation method has become a key tool to study the electric-magnetic-mechanical coupling characteristics of high temperature superconducting (HTS) Energy Storage Coils, especially in the multi-physics field coupling environment. In this paper, the T-A formulation of Maxwell's equations is used due to its high computational efficiency, strong adaptability and low resource requirement. The mechanical-electromagnetic coupling behavior of a 32T fully superconducting magnet in three typical excitation modes is analyzed in depth. Aiming at the limitation of the azimuthal shunt problem of no-insulation (NI) coils on the application of the algorithm, this study adopts the weak form equations to weaken Faraday's electromagnetic induction law which characterizes the relationship between the electric field and the magnetic field. The coupling solution method of current vector potential T and magnetic vector potential A is innovatively adopted. And the Lagrange multipliers and global equations are introduced to improve the conventional Neumann boundary conditions, thus effectively modeling the complex current distribution in HTS NI coils. In addition, based on the discrete coupling model, the COMSOL Multiphysics sub-region coupling modeling method is utilized combining the tilt angle of the tape and the strain-dependent characteristics of the critical current. The accurate quantitative analysis of the hoop stress-strain and tilt angle distribution characteristics of the NI coil is realized. The research results provide an important theoretical basis and technical support for the design and optimization of high-performance NI superconducting magnets.
{"title":"Multiphysics modeling of no-insulation HTS energy storage coils: Enhanced T-A formulation for electromagnetic-mechanical coupling under sequential excitation","authors":"Bingxu Su , Wenhai Zhou , Wei Liu , Rongli Jia , Nipeng Wang , Tingliang Chen , Rui Liang","doi":"10.1016/j.physc.2025.1354785","DOIUrl":"10.1016/j.physc.2025.1354785","url":null,"abstract":"<div><div>Numerical calculation method has become a key tool to study the electric-magnetic-mechanical coupling characteristics of high temperature superconducting (HTS) Energy Storage Coils, especially in the multi-physics field coupling environment. In this paper, the T-A formulation of Maxwell's equations is used due to its high computational efficiency, strong adaptability and low resource requirement. The mechanical-electromagnetic coupling behavior of a 32T fully superconducting magnet in three typical excitation modes is analyzed in depth. Aiming at the limitation of the azimuthal shunt problem of no-insulation (NI) coils on the application of the algorithm, this study adopts the weak form equations to weaken Faraday's electromagnetic induction law which characterizes the relationship between the electric field and the magnetic field. The coupling solution method of current vector potential <em>T</em> and magnetic vector potential <em>A</em> is innovatively adopted. And the Lagrange multipliers and global equations are introduced to improve the conventional Neumann boundary conditions, thus effectively modeling the complex current distribution in HTS NI coils. In addition, based on the discrete coupling model, the COMSOL Multiphysics sub-region coupling modeling method is utilized combining the tilt angle of the tape and the strain-dependent characteristics of the critical current. The accurate quantitative analysis of the hoop stress-strain and tilt angle distribution characteristics of the NI coil is realized. The research results provide an important theoretical basis and technical support for the design and optimization of high-performance NI superconducting magnets.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"637 ","pages":"Article 1354785"},"PeriodicalIF":1.0,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145010277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-08DOI: 10.1016/j.physc.2025.1354787
Lin Xu , Qunwu Pei , Jing Gao
Superconducting materials exhibit superior electromagnetic properties, such as zero electrical resistance and the Meissner effect. These characteristics endow superconducting materials with extensive application potential across contemporary sectors including energy, transportation, electric power, healthcare, telecommunications, and aerospace. However, superconducting materials typically operate within a sophisticated environment characterized by extremely low temperatures, intense magnetic fields, and significant current levels. Under the slight thermal, mechanical, electrical and magnetic disturbances, quenching is easy to occur, potentially endangering the stability and security of the system. For this reason, in order to reduce the damage to the superconducting system caused by quench, the multi-field coupling characteristics and thermoplastic response of superconducting composites and structures during quench are theoretically studied in this paper. Firstly, utilizing the geometric configuration of the high-temperature superconducting (HTS) energy storage coil, a finite element model of the multi-layer composite structure of the superconducting tape is established. Secondly, the quench behavior resulting from local thermal disturbances at various temperatures is investigated through the coupling of transient electromagnetic field equations and heat conduction equations. Studies indicate that the instantaneous evolution of strain is closely correlated with temperature changes during the quenching process. At positions laterally distant from the heat source, the strain exhibits an initial decreasing trend followed by an increase, characterized by a distinct minimum point on the strain curve. However, at locations proximal to the heat source, the strain demonstrates a characteristic of continuous growth. Besides, with the further development of quenching, the growth rate of tensile strain in the unquenched region is obviously accelerated. That is, the thermal expansion in the quenched region can be transmitted to the unquenched regions through the interlayer, resulting in mechanical deformation in these regions. This phenomenon can provide a new perspective and technical approach for quench detection of high temperature superconducting structures.
{"title":"Analysis of mechanical and quench behavior in high-temperature superconductors for energy storage coils","authors":"Lin Xu , Qunwu Pei , Jing Gao","doi":"10.1016/j.physc.2025.1354787","DOIUrl":"10.1016/j.physc.2025.1354787","url":null,"abstract":"<div><div>Superconducting materials exhibit superior electromagnetic properties, such as zero electrical resistance and the Meissner effect. These characteristics endow superconducting materials with extensive application potential across contemporary sectors including energy, transportation, electric power, healthcare, telecommunications, and aerospace. However, superconducting materials typically operate within a sophisticated environment characterized by extremely low temperatures, intense magnetic fields, and significant current levels. Under the slight thermal, mechanical, electrical and magnetic disturbances, quenching is easy to occur, potentially endangering the stability and security of the system. For this reason, in order to reduce the damage to the superconducting system caused by quench, the multi-field coupling characteristics and thermoplastic response of superconducting composites and structures during quench are theoretically studied in this paper. Firstly, utilizing the geometric configuration of the high-temperature superconducting (HTS) energy storage coil, a finite element model of the multi-layer composite structure of the superconducting tape is established. Secondly, the quench behavior resulting from local thermal disturbances at various temperatures is investigated through the coupling of transient electromagnetic field equations and heat conduction equations. Studies indicate that the instantaneous evolution of strain is closely correlated with temperature changes during the quenching process. At positions laterally distant from the heat source, the strain exhibits an initial decreasing trend followed by an increase, characterized by a distinct minimum point on the strain curve. However, at locations proximal to the heat source, the strain demonstrates a characteristic of continuous growth. Besides, with the further development of quenching, the growth rate of tensile strain in the unquenched region is obviously accelerated. That is, the thermal expansion in the quenched region can be transmitted to the unquenched regions through the interlayer, resulting in mechanical deformation in these regions. This phenomenon can provide a new perspective and technical approach for quench detection of high temperature superconducting structures.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"637 ","pages":"Article 1354787"},"PeriodicalIF":1.0,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145010279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-08-29DOI: 10.1016/j.physc.2025.1354788
Yong-Jun Chen
In this article, we demonstrate superconductivity of cuprates with oxygen deficiency in copper-oxygen planes and apical positions by checking Zhang-Rice singlets (ZRS’s) formation. The oxygen vacancies have different effects on critical temperature (Tc) evolution in underdoped regime and overdoped regime respectively. In the underdoped regime, the oxygen vacancies damage the ZRS formation on its adjacent Cu atoms and suppress the superconductivity identical to effects of impurity substitutions of Cu atoms. However, in the overdoped regime, the oxygen vacancies enhance the Tc which increases with increase of concentration of the oxygen vacancies. The superconductivity persists when the concentration of the oxygen vacancies is larger than 0.50 (per Cu atom) in the copper-oxygen plane. Effects of planar oxygen vacancies and apical vacancies with various concentrations have been examined. The superconductivity in the highly overdoped regime (doping level spans from 0.27 to 0.80) has been predicted. It suggests a new method to discover the new superconductors. Our results can explain post-annealing-induced enhancement of the Tc from 70 K to above 90 K in Sr2CuO3+δ with the oxygen vacancies in the copper-oxygen plane and the apical positions.
{"title":"Superconductivity in cuprates with planar oxygen vacancies and apical oxygen vacancies","authors":"Yong-Jun Chen","doi":"10.1016/j.physc.2025.1354788","DOIUrl":"10.1016/j.physc.2025.1354788","url":null,"abstract":"<div><div>In this article, we demonstrate superconductivity of cuprates with oxygen deficiency in copper-oxygen planes and apical positions by checking Zhang-Rice singlets (ZRS’s) formation. The oxygen vacancies have different effects on critical temperature (<em>T</em><sub>c</sub>) evolution in underdoped regime and overdoped regime respectively. In the underdoped regime, the oxygen vacancies damage the ZRS formation on its adjacent Cu atoms and suppress the superconductivity identical to effects of impurity substitutions of Cu atoms. However, in the overdoped regime, the oxygen vacancies enhance the <em>T</em><sub>c</sub> which increases with increase of concentration of the oxygen vacancies. The superconductivity persists when the concentration of the oxygen vacancies is larger than 0.50 (per Cu atom) in the copper-oxygen plane. Effects of planar oxygen vacancies and apical vacancies with various concentrations have been examined. The superconductivity in the highly overdoped regime (doping level spans from 0.27 to 0.80) has been predicted. It suggests a new method to discover the new superconductors. Our results can explain post-annealing-induced enhancement of the <em>T</em><sub>c</sub> from 70 K to above 90 K in Sr<sub>2</sub>CuO<sub>3+δ</sub> with the oxygen vacancies in the copper-oxygen plane and the apical positions.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"637 ","pages":"Article 1354788"},"PeriodicalIF":1.0,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144913141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-08-24DOI: 10.1016/j.physc.2025.1354789
Tammam M. Haddad , Xunpeng Zhang , Vitaliy E. Gasumyants
In this paper, we present the results of an experimental study of the temperature dependences of the thermopower, S, and the Nernst coefficient, Q, in samples of the YBa2Cu3-xZnxOy system with zinc content varying over a wide range. It is shown that, despite the fact that zinc doping has a very slight effect on the absolute values of the transport coefficients at T = 300 K, an increase in its content throughout the entire doping range studied leads to a consistent modification of the S(T) dependences, the nature of which is atypical for the cases of other cation substitutions in the YBa2Cu3Oy system. By analyzing the experimental results within the framework of the narrow-band model, we determined the values of the parameters characterizing the energy spectrum structure and charge carrier system properties in samples of different compositions, and then discussed their variations with increasing zinc content. The obtained calculation results clearly show that zinc substituting for the plane copper directly affects the normal-state energy spectrum of the YBa2Cu3Oy system, and also make it possible to explain all the observed specific features of the behavior of the transport coefficients in the studied system.
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