Pub Date : 2024-02-02DOI: 10.1088/2399-6528/ad2561
Essam El-Seidy, Mohamed Zayet, Amira R. Abdel-Malek, Aya Rabie
Game theory delves into the examination of strategic behaviour across diverse domains such as insurance, busi ness, military, biology, and more, with the aim of deriving optimal decisions. Recent research focusing on the alteration of memory in the donation game with simultaneous iterated rounds has spurred our interest in in vestigating this phenomenon within the realm of the strictly alternating donation game. This study proposes a novel decision-making approach, utilizing the pre-previous unit instead of the most recent one. The scope nar rows down to 16 employed strategies, each defined by finite two-state automata, while accounting for potential implementation errors in the computation of strategy payoffs. Dominant strategies are determined by assessing the interaction payoffs among strategy pairs. This article centers on the calculation of equilibrium points among heteroclinic three cycles, as there is a lack of a single strategy that is unequivocally dominant. Among the strategy landscapes, S2 emerges as a standout performer, displaying remarkable stability that surpasses other strategies. Contrariwise, S14 is the least effective tactic. This article centers on the calculation of equilibrium points among heteroclinic three cycles, as there is a lacks of single strategy that is unequivocally dominant. Among the strategy landscapes, S2 emerges as a standout performer, displaying remarkable stability that surpasses other strategies.
{"title":"An overview of the second-previous memory effect in the strictlyalternating donation game","authors":"Essam El-Seidy, Mohamed Zayet, Amira R. Abdel-Malek, Aya Rabie","doi":"10.1088/2399-6528/ad2561","DOIUrl":"https://doi.org/10.1088/2399-6528/ad2561","url":null,"abstract":"\u0000 Game theory delves into the examination of strategic behaviour across diverse domains such as insurance, busi ness, military, biology, and more, with the aim of deriving optimal decisions. Recent research focusing on the alteration of memory in the donation game with simultaneous iterated rounds has spurred our interest in in vestigating this phenomenon within the realm of the strictly alternating donation game. This study proposes a novel decision-making approach, utilizing the pre-previous unit instead of the most recent one. The scope nar rows down to 16 employed strategies, each defined by finite two-state automata, while accounting for potential implementation errors in the computation of strategy payoffs. Dominant strategies are determined by assessing the interaction payoffs among strategy pairs. This article centers on the calculation of equilibrium points among heteroclinic three cycles, as there is a lack of a single strategy that is unequivocally dominant. Among the strategy landscapes, S2 emerges as a standout performer, displaying remarkable stability that surpasses other strategies. Contrariwise, S14 is the least effective tactic. This article centers on the calculation of equilibrium points among heteroclinic three cycles, as there is a lacks of single strategy that is unequivocally dominant. Among the strategy landscapes, S2 emerges as a standout performer, displaying remarkable stability that surpasses other strategies.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139869476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-02DOI: 10.1088/2399-6528/ad2561
Essam El-Seidy, Mohamed Zayet, Amira R. Abdel-Malek, Aya Rabie
Game theory delves into the examination of strategic behaviour across diverse domains such as insurance, busi ness, military, biology, and more, with the aim of deriving optimal decisions. Recent research focusing on the alteration of memory in the donation game with simultaneous iterated rounds has spurred our interest in in vestigating this phenomenon within the realm of the strictly alternating donation game. This study proposes a novel decision-making approach, utilizing the pre-previous unit instead of the most recent one. The scope nar rows down to 16 employed strategies, each defined by finite two-state automata, while accounting for potential implementation errors in the computation of strategy payoffs. Dominant strategies are determined by assessing the interaction payoffs among strategy pairs. This article centers on the calculation of equilibrium points among heteroclinic three cycles, as there is a lack of a single strategy that is unequivocally dominant. Among the strategy landscapes, S2 emerges as a standout performer, displaying remarkable stability that surpasses other strategies. Contrariwise, S14 is the least effective tactic. This article centers on the calculation of equilibrium points among heteroclinic three cycles, as there is a lacks of single strategy that is unequivocally dominant. Among the strategy landscapes, S2 emerges as a standout performer, displaying remarkable stability that surpasses other strategies.
{"title":"An overview of the second-previous memory effect in the strictlyalternating donation game","authors":"Essam El-Seidy, Mohamed Zayet, Amira R. Abdel-Malek, Aya Rabie","doi":"10.1088/2399-6528/ad2561","DOIUrl":"https://doi.org/10.1088/2399-6528/ad2561","url":null,"abstract":"\u0000 Game theory delves into the examination of strategic behaviour across diverse domains such as insurance, busi ness, military, biology, and more, with the aim of deriving optimal decisions. Recent research focusing on the alteration of memory in the donation game with simultaneous iterated rounds has spurred our interest in in vestigating this phenomenon within the realm of the strictly alternating donation game. This study proposes a novel decision-making approach, utilizing the pre-previous unit instead of the most recent one. The scope nar rows down to 16 employed strategies, each defined by finite two-state automata, while accounting for potential implementation errors in the computation of strategy payoffs. Dominant strategies are determined by assessing the interaction payoffs among strategy pairs. This article centers on the calculation of equilibrium points among heteroclinic three cycles, as there is a lack of a single strategy that is unequivocally dominant. Among the strategy landscapes, S2 emerges as a standout performer, displaying remarkable stability that surpasses other strategies. Contrariwise, S14 is the least effective tactic. This article centers on the calculation of equilibrium points among heteroclinic three cycles, as there is a lacks of single strategy that is unequivocally dominant. Among the strategy landscapes, S2 emerges as a standout performer, displaying remarkable stability that surpasses other strategies.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139809318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-26DOI: 10.1088/2399-6528/ad22e6
Zhaofang Bai, Shuan-ping Du
Generating a long-distance quantum state with genuine quantum correlation (GQC) is one of the most essential functions of quantum networks to support quantum communication. Here, we pro- vide a deterministic scheme for generating multimode Gaussian states with certain GQC (including genuine entanglement). Efficient algorithms of generating multimode states are also proposed. Our scheme is useful for resolving the bottleneck in generating some multimode Gaussian states and may pave the way towards real world applications of preparing multipartite quantum states in current quantum technologies.
{"title":"Network mechanism for generating genuinely correlative Gaussian states","authors":"Zhaofang Bai, Shuan-ping Du","doi":"10.1088/2399-6528/ad22e6","DOIUrl":"https://doi.org/10.1088/2399-6528/ad22e6","url":null,"abstract":"\u0000 Generating a long-distance quantum state with genuine quantum correlation (GQC) is one of the most essential functions of quantum networks to support quantum communication. Here, we pro- vide a deterministic scheme for generating multimode Gaussian states with certain GQC (including genuine entanglement). Efficient algorithms of generating multimode states are also proposed. Our scheme is useful for resolving the bottleneck in generating some multimode Gaussian states and may pave the way towards real world applications of preparing multipartite quantum states in current quantum technologies.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139595540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-25DOI: 10.1088/2399-6528/ad1f74
Kohei Kobayashi
To implement quantum information technologies, carefully designed control for preparing a desired state plays a key role. However, in realistic situation, the actual performance of those methodologies is severely limited by decoherence. Therefore, it is important to evaluate how close we can steer the controlled state to a desired target state under decoherence. In this paper, we provide an upper bound of the distance between the two controlled quantum systems in the presence and absence of decoherence. The bound quantifies the degree of achievement of the control for a given target state under decoherence, and can be straightforwardly calculated without solving any equation. Moreover, the upper bound is applied to derive a theoretical limit of the probability for obtaining the target state under decoherence.
{"title":"Bound on the distance between controlled quantum state and target state under decoherence","authors":"Kohei Kobayashi","doi":"10.1088/2399-6528/ad1f74","DOIUrl":"https://doi.org/10.1088/2399-6528/ad1f74","url":null,"abstract":"To implement quantum information technologies, carefully designed control for preparing a desired state plays a key role. However, in realistic situation, the actual performance of those methodologies is severely limited by decoherence. Therefore, it is important to evaluate how close we can steer the controlled state to a desired target state under decoherence. In this paper, we provide an upper bound of the distance between the two controlled quantum systems in the presence and absence of decoherence. The bound quantifies the degree of achievement of the control for a given target state under decoherence, and can be straightforwardly calculated without solving any equation. Moreover, the upper bound is applied to derive a theoretical limit of the probability for obtaining the target state under decoherence.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139773454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-23DOI: 10.1088/2399-6528/ad1dc8
T J Volkoff, Michael J Martin
We show that the lowest quantum Cramér-Rao bound achievable in interferometry with a one-axis twisted spin coherent state is saturated by the asymptotic method of moments error of a protocol that uses one call to the one-axis twisting, one call to time-reversed one-axis twisting, and a final total spin measurement (i.e., a twist-untwist protocol). The result is derived by first showing that the metrological phase diagram for one-axis twisting is asymptotically characterized by a single quantum Fisher information value N(N + 1)/2 for all times, then constructing a twist-untwist protocol having a method of moments error that saturates this value. The case of finite-range one-axis twisting is similarly analyzed, and a simple functional form for the metrological phase diagram is found in both the short-range and long-range interaction regimes. Numerical evidence suggests that the finite-range analogues of twist-untwist protocols can exhibit a method of moments error that asymptotically saturates the lowest quantum Cramér-Rao bound achievable in interferometry with finite-range one-axis twisted spin coherent states for all interaction times.
{"title":"Saturating the one-axis twisting quantum Cramér-Rao bound with a total spin readout","authors":"T J Volkoff, Michael J Martin","doi":"10.1088/2399-6528/ad1dc8","DOIUrl":"https://doi.org/10.1088/2399-6528/ad1dc8","url":null,"abstract":"We show that the lowest quantum Cramér-Rao bound achievable in interferometry with a one-axis twisted spin coherent state is saturated by the asymptotic method of moments error of a protocol that uses one call to the one-axis twisting, one call to time-reversed one-axis twisting, and a final total spin measurement (i.e., a twist-untwist protocol). The result is derived by first showing that the metrological phase diagram for one-axis twisting is asymptotically characterized by a single quantum Fisher information value <italic toggle=\"yes\">N</italic>(<italic toggle=\"yes\">N</italic> + 1)/2 for all times, then constructing a twist-untwist protocol having a method of moments error that saturates this value. The case of finite-range one-axis twisting is similarly analyzed, and a simple functional form for the metrological phase diagram is found in both the short-range and long-range interaction regimes. Numerical evidence suggests that the finite-range analogues of twist-untwist protocols can exhibit a method of moments error that asymptotically saturates the lowest quantum Cramér-Rao bound achievable in interferometry with finite-range one-axis twisted spin coherent states for all interaction times.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139767879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-19DOI: 10.1088/2399-6528/ad1dc7
Tom G Mackay, Akhlesh Lakhtakia
Gyrotropic dielectric materials, being Lorentz non-reciprocal, exhibit scientifically and technologically interesting reflection asymmetries. On numerically characterizing left/right asymmetries in linear reflectances exhibited by a gyrotropic dielectric slab, we found these asymmetries to be highly sensitive to: (i) the constitutive parameters of the gyrotropic dielectric material, (ii) the thickness of the slab, (iii) the direction of incidence, and (iv) the refractive indexes of the isotropic dielectric materials above and below the slab. In particular, left/right reflectance asymmetries increase as (i) dissipation in the gyrotropic dielectric material decreases and (ii) the anti-symmetric component of the relative permittivity dyadic of that material increases. Generally, the cross-polarized left/right reflectance asymmetry is an order of magnitude smaller than the co-polarized left/right reflectance asymmetries.
{"title":"On maximum left/right reflectance asymmetry exhibited by a gyrotropic dielectric slab","authors":"Tom G Mackay, Akhlesh Lakhtakia","doi":"10.1088/2399-6528/ad1dc7","DOIUrl":"https://doi.org/10.1088/2399-6528/ad1dc7","url":null,"abstract":"Gyrotropic dielectric materials, being Lorentz non-reciprocal, exhibit scientifically and technologically interesting reflection asymmetries. On numerically characterizing left/right asymmetries in linear reflectances exhibited by a gyrotropic dielectric slab, we found these asymmetries to be highly sensitive to: (i) the constitutive parameters of the gyrotropic dielectric material, (ii) the thickness of the slab, (iii) the direction of incidence, and (iv) the refractive indexes of the isotropic dielectric materials above and below the slab. In particular, left/right reflectance asymmetries increase as (i) dissipation in the gyrotropic dielectric material decreases and (ii) the anti-symmetric component of the relative permittivity dyadic of that material increases. Generally, the cross-polarized left/right reflectance asymmetry is an order of magnitude smaller than the co-polarized left/right reflectance asymmetries.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139508577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-17DOI: 10.1088/2399-6528/ad1f71
La Hamimu La Hamimu, E. Cahyono, Herdi Budiman, S. R. Haraty, Natalis Ransi
The characteristics of multimode Love wave dispersion curves are dependent on various geophysical parameters, namely shear wave velocity (SWV), layer thickness and density. This paper presents a novel numerical analysis of these parameters to determine which ones have a significant effect on the dispersion curves of multimode Love waves. Identifying parameter sensitivity is a crucial step in the inversion procedure of geophysical modeling. Our numerical analysis focuses on perturbing three geophysical parameters that influence the dispersion curves. The results confirm that SWV parameter is the most sensitive. By employing the same perturbation procedure, our numerical analysis reveals that the SWV parameter has a highly significant impact on the multimode Love wave dispersion curves. The average relative error (RE) values are found to be 27.33% for alpha=-0.2 and 25.51% for alpha=+0.2. Conversely, perturbing the layer thickness parameter demonstrates no significant influence on the dispersion curves, resulting in average RE values of 5.69% for alpha=-0.2 and 7.96% for alpha=+0.2. Furthermore, the perturbation of the density parameter exhibits an extremely negligible impact on the multimode Love wave dispersion curves, with average RE values on the order of 10^(−14)%.
{"title":"Numerical analysis of the geophysical parameter sensitivity on the multimode love wave dispersion curves","authors":"La Hamimu La Hamimu, E. Cahyono, Herdi Budiman, S. R. Haraty, Natalis Ransi","doi":"10.1088/2399-6528/ad1f71","DOIUrl":"https://doi.org/10.1088/2399-6528/ad1f71","url":null,"abstract":"\u0000 The characteristics of multimode Love wave dispersion curves are dependent on various geophysical parameters, namely shear wave velocity (SWV), layer thickness and density. This paper presents a novel numerical analysis of these parameters to determine which ones have a significant effect on the dispersion curves of multimode Love waves. Identifying parameter sensitivity is a crucial step in the inversion procedure of geophysical modeling. Our numerical analysis focuses on perturbing three geophysical parameters that influence the dispersion curves. The results confirm that SWV parameter is the most sensitive. By employing the same perturbation procedure, our numerical analysis reveals that the SWV parameter has a highly significant impact on the multimode Love wave dispersion curves. The average relative error (RE) values are found to be 27.33% for alpha=-0.2 and 25.51% for alpha=+0.2. Conversely, perturbing the layer thickness parameter demonstrates no significant influence on the dispersion curves, resulting in average RE values of 5.69% for alpha=-0.2 and 7.96% for alpha=+0.2. Furthermore, the perturbation of the density parameter exhibits an extremely negligible impact on the multimode Love wave dispersion curves, with average RE values on the order of 10^(−14)%.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139617164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-17DOI: 10.1088/2399-6528/ad1f72
Deepak Samuel, L. Murgod
The upcoming India-based Neutrino Observatory (INO) will host a 50 kton magnetized Iron Calorimeter (ICAL) to study atmospheric neutrinos. As part of its proposal, small-scale prototype detectors have been built and are in operation. The primary focus in these prototypes has been on detector characterization studies. At the same time, few physics analyses were also carried out with the cosmic muon data collected. However, due to the small size of the detectors, such analyses always relied on the assumption that the tracks were of single muons only. Consequently, multi-muon events were discarded as noisy events, reducing the physics potential. In this work, we report the development of a machine learning model to predict multi-muon events, study its efficiency and report the muon multiplicity distribution observed using cosmic muon events from the prototype detector.
{"title":"Machine learning-based prediction of multi-muon events in the INO-ICAL prototype stack","authors":"Deepak Samuel, L. Murgod","doi":"10.1088/2399-6528/ad1f72","DOIUrl":"https://doi.org/10.1088/2399-6528/ad1f72","url":null,"abstract":"\u0000 The upcoming India-based Neutrino Observatory (INO) will host a 50 kton magnetized Iron Calorimeter (ICAL) to study atmospheric neutrinos. As part of its proposal, small-scale prototype detectors have been built and are in operation. The primary focus in these prototypes has been on detector characterization studies. At the same time, few physics analyses were also carried out with the cosmic muon data collected. However, due to the small size of the detectors, such analyses always relied on the assumption that the tracks were of single muons only. Consequently, multi-muon events were discarded as noisy events, reducing the physics potential. In this work, we report the development of a machine learning model to predict multi-muon events, study its efficiency and report the muon multiplicity distribution observed using cosmic muon events from the prototype detector.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139616657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-11DOI: 10.1088/2399-6528/ad1dc9
Subhankar Roy, M. Ummal Momeen
We present and investigate a highly directional diamond based optical nanostructure embedded with an elliptical solid immersion lens (e-SIL). An in depth analysis of the far field evolution is elucidated with respect to geometrical modification. This design is capable of producing a maximum directivity of ~11 dB at its optimized position. Geometrical tolerance and directional behavior has been studied within a wide range of dipole variation. The incident light source noise is neutralized with the manipulation of e-SIL geometry by considering an experimental simulation environment. Enhancement in directivity near NV center zero phonon line (ZPL) region with reduced excitation light source noise can improve the overall efficiency of the NV single photon emitter and can be useful for multiple photonic applications.
{"title":"A geometry dependent directivity analysis of an optical structure based on NV center in diamond","authors":"Subhankar Roy, M. Ummal Momeen","doi":"10.1088/2399-6528/ad1dc9","DOIUrl":"https://doi.org/10.1088/2399-6528/ad1dc9","url":null,"abstract":"\u0000 We present and investigate a highly directional diamond based optical nanostructure embedded with an elliptical solid immersion lens (e-SIL). An in depth analysis of the far field evolution is elucidated with respect to geometrical modification. This design is capable of producing a maximum directivity of ~11 dB at its optimized position. Geometrical tolerance and directional behavior has been studied within a wide range of dipole variation. The incident light source noise is neutralized with the manipulation of e-SIL geometry by considering an experimental simulation environment. Enhancement in directivity near NV center zero phonon line (ZPL) region with reduced excitation light source noise can improve the overall efficiency of the NV single photon emitter and can be useful for multiple photonic applications.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139534461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-05DOI: 10.1088/2399-6528/ad1bb5
D. Szewczyk, A. Krivchikov, A. Jeżowski
The temperature dependencies of the thermal conductivity coefficient, κ(T), in 1-fluoroadamantane were investigated for two different orientationally-disordered states. In the first one, κ(T) exhibits a crystalline character with a typical maximum and two anomalous regions marked at higher temperatures. Here, the low-temperature power-law dependence is reduced due to a relatively large contribution of dislocations and defects in the polycrystalline sample. Above 196 K, there is an anomalous plateau in thermal conductivity resulting from the presence of an intermediate centrosymmetric state. Further, a significant increase in κ occurs above 234 K, resulting from a phase transition to a high-temperature disordered cubic phase. Subsequent cooling of the sample leads to an irreversible transition towards a disordered state resulting in a κ(T) dependence corresponding to an amorphous material behavior. The primary anomaly at 196 K disappears, while the second one associated with the phase transition at 227 K shifts towards lower temperatures. The irreversibility of this transformation is also verified by scanning microscopy images. Thermal conductivity in both phases has an additional contribution of an Arrhenius type in their temperature dependences.
针对两种不同的取向有序状态，研究了 1-氟金刚烷中导热系数 κ(T) 的温度依赖性。在第一种状态中，κ(T) 表现出结晶特性，在较高温度下有一个典型的最大值和两个异常区域。在这里，由于多晶样品中位错和缺陷的贡献相对较大，低温幂律依赖性减弱。在 196 K 以上，由于存在中间向心对称态，热导率出现异常高原。此外，在 234 K 以上，κ 出现了显著的增加，这是由于相变到了高温无序立方相。样品随后的冷却会导致向无序态的不可逆转变，从而产生与无定形材料行为相对应的κ(T)依赖关系。196 K 时的主要异常现象消失了，而与 227 K 时相变相关的第二个异常现象则向更低的温度转移。扫描显微镜图像也验证了这种转变的不可逆性。这两种相的导热性在其温度相关性中都有阿伦尼乌斯类型的额外贡献。
{"title":"Polymorphic states investigations in thermal conductivity of 1-fluoroadamantane","authors":"D. Szewczyk, A. Krivchikov, A. Jeżowski","doi":"10.1088/2399-6528/ad1bb5","DOIUrl":"https://doi.org/10.1088/2399-6528/ad1bb5","url":null,"abstract":"\u0000 The temperature dependencies of the thermal conductivity coefficient, κ(T), in 1-fluoroadamantane were investigated for two different orientationally-disordered states. In the first one, κ(T) exhibits a crystalline character with a typical maximum and two anomalous regions marked at higher temperatures. Here, the low-temperature power-law dependence is reduced due to a relatively large contribution of dislocations and defects in the polycrystalline sample. Above 196 K, there is an anomalous plateau in thermal conductivity resulting from the presence of an intermediate centrosymmetric state. Further, a significant increase in κ occurs above 234 K, resulting from a phase transition to a high-temperature disordered cubic phase. Subsequent cooling of the sample leads to an irreversible transition towards a disordered state resulting in a κ(T) dependence corresponding to an amorphous material behavior. The primary anomaly at 196 K disappears, while the second one associated with the phase transition at 227 K shifts towards lower temperatures. The irreversibility of this transformation is also verified by scanning microscopy images. Thermal conductivity in both phases has an additional contribution of an Arrhenius type in their temperature dependences.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139383597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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