Two simple effective models for the low-temperature (however higher than the temperature of the transition to the superconducting phase) behavior of magnetic and magnetocaloric characteristics in the external magnetic field in UTe2 are proposed. The models are based on the dual nature of 5f electrons and take into account both itinerant electrons and localized electrons of U ions. Several magnetic characteristics including the magnetocaloric ones have been calculated for those scenarios. It is expected that by observing the features of the characteristics of the magnetocaloric effect in UTe2 and comparing them with the ones, predicted by the theory, one can choose the model, that can better describe the specific magnetic properties of UTe2 at low temperatures in the normal phase.
针对碲化镉(UTe2)在外部磁场中的低温（但高于向超导相转变的温度）磁性和磁致特性行为，提出了两个简单有效的模型。这些模型基于 5f 电子的双重性质，并考虑到了 U 离子的巡回电子和局域电子。针对这些方案计算了包括磁致性在内的若干磁特性。通过观察碲化镉的磁致效应特征并将其与理论预测的特征进行比较，我们可以选择能更好地描述碲化镉在低温下正常相的特定磁特性的模型。
{"title":"Magnetocaloric effect in UTe2: Theory predictions","authors":"A. A. Zvyagin, G. A. Zvyagina","doi":"10.1063/10.0026281","DOIUrl":"https://doi.org/10.1063/10.0026281","url":null,"abstract":"Two simple effective models for the low-temperature (however higher than the temperature of the transition to the superconducting phase) behavior of magnetic and magnetocaloric characteristics in the external magnetic field in UTe2 are proposed. The models are based on the dual nature of 5f electrons and take into account both itinerant electrons and localized electrons of U ions. Several magnetic characteristics including the magnetocaloric ones have been calculated for those scenarios. It is expected that by observing the features of the characteristics of the magnetocaloric effect in UTe2 and comparing them with the ones, predicted by the theory, one can choose the model, that can better describe the specific magnetic properties of UTe2 at low temperatures in the normal phase.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"63 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141742023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Yo Machida, Valentina Martelli, Alexandre Jaoui, Benoît Fauqué, Kamran Behnia
Decades ago, Gurzhi proposed that if momentum-conserving collisions prevail among heat-carrying phonons in insulators and charge-carrying electrons in metals, hydrodynamic features will become detectable. In this paper, we will review the experimental evidence emerging in the last few years supporting this viewpoint and raising new questions. The focus of the paper will be bulk crystals without (or with a very dilute concentration of) mobile electrons and steady-state thermal transport. We also discuss the possible link between this field of investigation and other phenomena, such as the hybridization of phonon modes and the phonon thermal Hall effect.
{"title":"Phonon hydrodynamics in bulk insulators and semimetals","authors":"Yo Machida, Valentina Martelli, Alexandre Jaoui, Benoît Fauqué, Kamran Behnia","doi":"10.1063/10.0026323","DOIUrl":"https://doi.org/10.1063/10.0026323","url":null,"abstract":"Decades ago, Gurzhi proposed that if momentum-conserving collisions prevail among heat-carrying phonons in insulators and charge-carrying electrons in metals, hydrodynamic features will become detectable. In this paper, we will review the experimental evidence emerging in the last few years supporting this viewpoint and raising new questions. The focus of the paper will be bulk crystals without (or with a very dilute concentration of) mobile electrons and steady-state thermal transport. We also discuss the possible link between this field of investigation and other phenomena, such as the hybridization of phonon modes and the phonon thermal Hall effect.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"62 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141742016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
E. V. Petrenko, K. Rogacki, A. V. Terekhov, L. V. Bludova, Yu. A. Kolesnichenko, N. V. Shytov, D. M. Sergeyev, E. Lähderanta, A. L. Solovjov
The evolution of the temperature dependence of the pseudogap Δ*(T) in optimally doped (OD) YBa2Cu3O7–δ (YBCO) films with the superconducting critical temperature Tc = 88.7 K under the influence of a magnetic field B has been studied in detail. It has been established that the shape of Δ*(T) for various B over the entire range from the pseudogap opening temperature T* to T01, below which superconducting fluctuations occur, has a wide maximum at the BEC-BCS crossover temperature Tpair, which is typical for OD films and untwinned YBCO single crystals. T* was shown to be independent on B, whereas Tpair shifts to the low-temperature region along with the increase in B, while the maximum value of Δ*(Tpair) remains practically constant regardless of B. It was revealed that as the field increases, the low-temperature maximum near the 3D-2D transition temperature T0 is blurred and disappears at B > 5 T. Moreover, above the Ginzburg temperature TG, which limits superconducting fluctuations from below, for B > 0.5 T, a minimum appears on Δ*(T) at Tmin, which becomes very pronounced with a further increase in B. As a result, the overall value of Δ*(T) decreases noticeably most likely due to the pair-breaking effect. A comparison of Δ*(T) near Tc with the Peters–Bauer theory shows that the density of fluctuating Cooper pairs actually decreases from ⟨n↑n↓⟩ ≈ 0.31 at B = 0 to ⟨n↑n↓⟩ ≈ 0.28 in the field of 8 T. The observed behavior of Δ*(T) around Tmin is assumed to be due to the influence of a two-dimensional vortex lattice created by the magnetic field, which prevents the formation of fluctuating Cooper pairs near Tc.
我们详细研究了在磁场 B 的影响下，具有超导临界温度 Tc = 88.7 K 的最佳掺杂 (OD) YBa2Cu3O7-δ (YBCO) 薄膜中伪隙 Δ*(T) 的温度依赖性演变。研究发现，从伪隙打开温度 T* 到 T01（超导波动发生在 T01 以下）的整个范围内，不同 B 的 Δ*(T)形状在 BEC-BCS 交叉温度 Tpair 处有一个宽的最大值，这是 OD 薄膜和未捻合 YBCO 单晶的典型特征。研究表明，T* 与 B 无关，而 Tpair 则随着 B 的增大而转移到低温区域，而 Δ*(Tpair)的最大值实际上保持不变，与 B 无关。研究表明，随着磁场的增大，三维-二维转变温度 T0 附近的低温最大值变得模糊，并在 B > 5 T 时消失。此外，在 B > 0.5 T 时，在金兹堡温度 TG（从下到上限制超导波动）之上，Δ*(T) 在 Tmin 处出现一个最小值，随着 B 的进一步增大，这个最小值变得非常明显。将 Tc 附近的 Δ*(T) 与彼得斯-鲍尔理论进行比较后发现，波动库珀对的密度实际上从 B = 0 时的➎n↑n↓⟩≈0.31 下降到 8 T 磁场中的➎n↑n↓⟩≈0.28。在 Tmin 附近观察到的Δ*(T)行为，假定是由于磁场产生的二维涡晶格的影响，它阻止了波动库珀对在 Tc 附近的形成。
{"title":"Evolution of the pseudogap temperature dependence in YBa2Cu3O7–δ films under the influence of a magnetic field","authors":"E. V. Petrenko, K. Rogacki, A. V. Terekhov, L. V. Bludova, Yu. A. Kolesnichenko, N. V. Shytov, D. M. Sergeyev, E. Lähderanta, A. L. Solovjov","doi":"10.1063/10.0025295","DOIUrl":"https://doi.org/10.1063/10.0025295","url":null,"abstract":"The evolution of the temperature dependence of the pseudogap Δ*(T) in optimally doped (OD) YBa2Cu3O7–δ (YBCO) films with the superconducting critical temperature Tc = 88.7 K under the influence of a magnetic field B has been studied in detail. It has been established that the shape of Δ*(T) for various B over the entire range from the pseudogap opening temperature T* to T01, below which superconducting fluctuations occur, has a wide maximum at the BEC-BCS crossover temperature Tpair, which is typical for OD films and untwinned YBCO single crystals. T* was shown to be independent on B, whereas Tpair shifts to the low-temperature region along with the increase in B, while the maximum value of Δ*(Tpair) remains practically constant regardless of B. It was revealed that as the field increases, the low-temperature maximum near the 3D-2D transition temperature T0 is blurred and disappears at B > 5 T. Moreover, above the Ginzburg temperature TG, which limits superconducting fluctuations from below, for B > 0.5 T, a minimum appears on Δ*(T) at Tmin, which becomes very pronounced with a further increase in B. As a result, the overall value of Δ*(T) decreases noticeably most likely due to the pair-breaking effect. A comparison of Δ*(T) near Tc with the Peters–Bauer theory shows that the density of fluctuating Cooper pairs actually decreases from ⟨n↑n↓⟩ ≈ 0.31 at B = 0 to ⟨n↑n↓⟩ ≈ 0.28 in the field of 8 T. The observed behavior of Δ*(T) around Tmin is assumed to be due to the influence of a two-dimensional vortex lattice created by the magnetic field, which prevents the formation of fluctuating Cooper pairs near Tc.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"149 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2024-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140800401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
The electrical characteristics of a point section of niobium oxide between a massive cathode made of a superconducting indium-tin alloy and a niobium film before the oxide breakdown and the nanocontact that appears after the breakdown of the oxide at room temperature have been studied. The dependencies of the point breakdown voltage of the oxide and the resistance of nanocontacts on the method of breakdown and the thickness of the oxide in the range of 15–60 nm have been established. In particular, a minimum value of the breakdown current has been established (about 1 μA), below which breakdown does not occur. The voltage-current characteristic (VCC) of the oxide has a semiconductor character and indicates the dependence of the breakdown voltage of the oxide on its polarity. The VCC of the nanocontact is nonlinear, which is associated with phase transitions in the nanocontact material caused by its heating by the transport current.
{"title":"Features of nanocontact formed using point electrical breakdown of a niobium oxide nanolayer","authors":"S. I. Bondarenko, A. V. Krevsun, V. P. Koverya","doi":"10.1063/10.0025302","DOIUrl":"https://doi.org/10.1063/10.0025302","url":null,"abstract":"The electrical characteristics of a point section of niobium oxide between a massive cathode made of a superconducting indium-tin alloy and a niobium film before the oxide breakdown and the nanocontact that appears after the breakdown of the oxide at room temperature have been studied. The dependencies of the point breakdown voltage of the oxide and the resistance of nanocontacts on the method of breakdown and the thickness of the oxide in the range of 15–60 nm have been established. In particular, a minimum value of the breakdown current has been established (about 1 μA), below which breakdown does not occur. The voltage-current characteristic (VCC) of the oxide has a semiconductor character and indicates the dependence of the breakdown voltage of the oxide on its polarity. The VCC of the nanocontact is nonlinear, which is associated with phase transitions in the nanocontact material caused by its heating by the transport current.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"16 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2024-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140800402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Heat transfer in layered metal-dielectric structures is considered theoretically based on an analytical solution of the Boltzmann transfer equation for the phonon distribution function. Taking into account the size effect, the problem of effective cross-plane thermal conductivity of structures containing two metal layers is analyzed in detail. If the thickness of the metal layers is less than the phonon mean free path, interlayer heat transfer is carried out predominantly by phonons, and the effective cross-plane thermal conductivity is determined by the reflection of phonons from the metal/dielectric interfaces. In the opposite case of thick metal layers, the effective cross-plane thermal conductivity is determined both by the thermal conductivity of the metal layers and by the thermal resistance of the dielectric layers. The results obtained are generalized to multilayer structures and superlattices.
{"title":"Effective cross-plane thermal conductivity of metal-dielectric multilayers at low temperatures","authors":"A. I. Bezuglyj, I. V. Mironenko, V. A. Shklovskij","doi":"10.1063/10.0025298","DOIUrl":"https://doi.org/10.1063/10.0025298","url":null,"abstract":"Heat transfer in layered metal-dielectric structures is considered theoretically based on an analytical solution of the Boltzmann transfer equation for the phonon distribution function. Taking into account the size effect, the problem of effective cross-plane thermal conductivity of structures containing two metal layers is analyzed in detail. If the thickness of the metal layers is less than the phonon mean free path, interlayer heat transfer is carried out predominantly by phonons, and the effective cross-plane thermal conductivity is determined by the reflection of phonons from the metal/dielectric interfaces. In the opposite case of thick metal layers, the effective cross-plane thermal conductivity is determined both by the thermal conductivity of the metal layers and by the thermal resistance of the dielectric layers. The results obtained are generalized to multilayer structures and superlattices.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"247 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2024-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140800403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
S. V. Cherednichenko, G. V. Andrievsky, N. A. Vinnikov, A. V. Dolbin, M. V. Kosevich, V. S. Shelkovsky, R. M. Basnukaeva, O. P. Gnatyuk, O. Bezkrovnyi, M. Ptak, M. Chaika, P. O. Kuzema, G. I. Dovbeshko
Vacuum-sublimation cryogenic deposition (VS-CD) method is successfully applied to produce fullerene water colloidal solution (FWCS): the melting of the solid phase of the mixture obtained by joint condensation of C60 fullerene and water vapors onto a surface cooled with liquid nitrogen results in formation of a stable colloidal solution. The results of the FWCS characterization by means of Raman, IR, and UV-Vis spectroscopy and their comparison with known literature data on hydrated fullerenes give the authors an opportunity to make conclusion that the FWCS contains C60@{H2O}n complexes of hydrated C60 fullerene. Transmission electron microscopy shows that the VS-CD-produced material contains predominantly small C60 clusters of about 2–5 nm size, while mass spectrometry with laser desorption/ionization has demonstrated the presence of pure fullerene C60 and the absence of any products of its transformation. The performed analysis reveals a close similarity of the stable C60@{H2O}n complexes generated by VS-CD with the previously known highly hydrophilic hydrated fullerene obtained by ultrasonication method.
{"title":"Raman, UV-Vis, MS, and IR characterization of molecular-colloidal solution of hydrated fullerenes C60 obtained using vacuum-sublimation cryogenic deposition method. Is the C60 molecule truly highly hydrophobic?","authors":"S. V. Cherednichenko, G. V. Andrievsky, N. A. Vinnikov, A. V. Dolbin, M. V. Kosevich, V. S. Shelkovsky, R. M. Basnukaeva, O. P. Gnatyuk, O. Bezkrovnyi, M. Ptak, M. Chaika, P. O. Kuzema, G. I. Dovbeshko","doi":"10.1063/10.0024965","DOIUrl":"https://doi.org/10.1063/10.0024965","url":null,"abstract":"Vacuum-sublimation cryogenic deposition (VS-CD) method is successfully applied to produce fullerene water colloidal solution (FWCS): the melting of the solid phase of the mixture obtained by joint condensation of C60 fullerene and water vapors onto a surface cooled with liquid nitrogen results in formation of a stable colloidal solution. The results of the FWCS characterization by means of Raman, IR, and UV-Vis spectroscopy and their comparison with known literature data on hydrated fullerenes give the authors an opportunity to make conclusion that the FWCS contains C60@{H2O}n complexes of hydrated C60 fullerene. Transmission electron microscopy shows that the VS-CD-produced material contains predominantly small C60 clusters of about 2–5 nm size, while mass spectrometry with laser desorption/ionization has demonstrated the presence of pure fullerene C60 and the absence of any products of its transformation. The performed analysis reveals a close similarity of the stable C60@{H2O}n complexes generated by VS-CD with the previously known highly hydrophilic hydrated fullerene obtained by ultrasonication method.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"55 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140315524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
D. E. Hurova, V. G. Geidarov, I. S. Braude, N. A. Aksenova, S. G. Stepanian, L. Adamowicz, N. N. Galtsov
To analyze X-ray diffraction patterns obtained from polyimide films subjected to external influence (uniaxial tension and exposure at liquid helium temperature), radial distribution function (RDF) curves were constructed and the geometry of the 4,4′-oxydiphenylene-pyromellitimide monomer (PM) was calculated. From the RDF analysis, it follows that uniaxial tension of PM polymer films leads to a change in the geometry of the monomer, and exposure at low temperatures leads to mutual ordering of the polymer chains.
为了分析受到外部影响（单轴拉力和液氦温度下的暴露）的聚酰亚胺薄膜所获得的 X 射线衍射图样，我们构建了径向分布函数（RDF）曲线，并计算了 4,4′-氧二苯基吡喃亚胺单体（PM）的几何形状。从 RDF 分析中可以看出，PM 聚合物薄膜的单轴拉伸会导致单体的几何形状发生变化，而低温暴露则会导致聚合物链的相互有序化。
{"title":"Structural studies of amorphous polymer films: Experiment and calculation","authors":"D. E. Hurova, V. G. Geidarov, I. S. Braude, N. A. Aksenova, S. G. Stepanian, L. Adamowicz, N. N. Galtsov","doi":"10.1063/10.0024972","DOIUrl":"https://doi.org/10.1063/10.0024972","url":null,"abstract":"To analyze X-ray diffraction patterns obtained from polyimide films subjected to external influence (uniaxial tension and exposure at liquid helium temperature), radial distribution function (RDF) curves were constructed and the geometry of the 4,4′-oxydiphenylene-pyromellitimide monomer (PM) was calculated. From the RDF analysis, it follows that uniaxial tension of PM polymer films leads to a change in the geometry of the monomer, and exposure at low temperatures leads to mutual ordering of the polymer chains.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"44 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140315643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
O. A. Boryak, V. S. Shelkovsky, V. V. Orlov, V. G. Zobnina, M. V. Kosevich
A problem of necessity of concentrating trace admixtures of metal ions required for ecological water analysis can be overcome by harnessing a physical phenomenon of phase separation in aqueous solutions during their freezing. It is shown that the accumulation of metal-containing solutes in the channels between ice crystallites in the frozen solids is sufficient for their successful detection by means of low-temperature secondary emission mass spectrometry. Sufficiency of microliters volumes of water is an advantage of such an approach. Observation of various types of metal ions in frozen water samples is demonstrated on the examples of tap water, sea water, snow and a medicinal preparation. Revisiting and summation of physical basics of mass spectrometric examining of frozen water-inorganic salt solutions and estimates of advancement of mass spectrometric instrumentation permit us to propose a workflow for accelerated and simplified mass spectrometric detection of metal pollutants in water.
{"title":"Advantages of the low-temperature secondary emission mass spectrometry in analysis of metal ions in water samples revisited","authors":"O. A. Boryak, V. S. Shelkovsky, V. V. Orlov, V. G. Zobnina, M. V. Kosevich","doi":"10.1063/10.0024963","DOIUrl":"https://doi.org/10.1063/10.0024963","url":null,"abstract":"A problem of necessity of concentrating trace admixtures of metal ions required for ecological water analysis can be overcome by harnessing a physical phenomenon of phase separation in aqueous solutions during their freezing. It is shown that the accumulation of metal-containing solutes in the channels between ice crystallites in the frozen solids is sufficient for their successful detection by means of low-temperature secondary emission mass spectrometry. Sufficiency of microliters volumes of water is an advantage of such an approach. Observation of various types of metal ions in frozen water samples is demonstrated on the examples of tap water, sea water, snow and a medicinal preparation. Revisiting and summation of physical basics of mass spectrometric examining of frozen water-inorganic salt solutions and estimates of advancement of mass spectrometric instrumentation permit us to propose a workflow for accelerated and simplified mass spectrometric detection of metal pollutants in water.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"33 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140315452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
M. Olenchuk, T. Hanulia, A. Nikolenko, G. Dovbeshko
The study of large biomolecules, in particular DNA, is of practical interest. Marker bands of the Raman spectrum of DNA provide information about the conformational state and structure of the macromolecule. At the same time, when dealing with biological experiments, a small amount of DNA is available, which is why it is important to enhance the signal from DNA and find the proper substrate. However, it is difficult to enhance Raman spectra for large molecules as DNA without functionalization that could introduce changes in the DNA structure. In this work, a conventional substrate as CaF2 and a photonic crystal as a substrate with enhancer signal property and without DNA functionalization were applied. The factor of enhancement for DNA from salmon testes was reached up to 10 without Raman spectra distortion. The Raman spectral bands on different types of substrates are analyzed and compared.
研究大型生物大分子，尤其是 DNA，具有实际意义。DNA 拉曼光谱的标记带提供了有关大分子构象状态和结构的信息。与此同时，在进行生物实验时，可用的 DNA 数量很少，因此增强 DNA 信号并找到合适的底物非常重要。然而，要增强 DNA 这种大分子的拉曼光谱，如果不进行功能化处理，DNA 的结构就会发生变化，这一点非常困难。在这项工作中，应用了 CaF2 这种传统基底和光子晶体这种具有增强信号特性且未进行 DNA 功能化的基底。来自鲑鱼睾丸的 DNA 的增强因子高达 10，而拉曼光谱没有发生扭曲。对不同类型基底上的拉曼光谱带进行了分析和比较。
{"title":"Enhanced DNA Raman modes probed by SiO2 photonic crystals","authors":"M. Olenchuk, T. Hanulia, A. Nikolenko, G. Dovbeshko","doi":"10.1063/10.0024964","DOIUrl":"https://doi.org/10.1063/10.0024964","url":null,"abstract":"The study of large biomolecules, in particular DNA, is of practical interest. Marker bands of the Raman spectrum of DNA provide information about the conformational state and structure of the macromolecule. At the same time, when dealing with biological experiments, a small amount of DNA is available, which is why it is important to enhance the signal from DNA and find the proper substrate. However, it is difficult to enhance Raman spectra for large molecules as DNA without functionalization that could introduce changes in the DNA structure. In this work, a conventional substrate as CaF2 and a photonic crystal as a substrate with enhancer signal property and without DNA functionalization were applied. The factor of enhancement for DNA from salmon testes was reached up to 10 without Raman spectra distortion. The Raman spectral bands on different types of substrates are analyzed and compared.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"5 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140316890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
The phase diagrams for the light H2O, heavy D2O water, and inert substances (Ne, Ar, Kr, and Xe) have been compared. A method of choosing the starting point for entropy and internal energy was proposed. It allowed testing the principle of corresponding states using caloric variables. In the given coordinates of temperature, pressure, and chemical potential, the water isotopologues form one group of substances and have similar phase diagrams. The inert substances in the same coordinates form another group of substances with similar phase diagrams. The phase diagrams for inert Ne with significant de Boer quantum parameters differ to a certain extent from the phase diagrams of other inert substances.
比较了轻 H2O、重 D2O 水和惰性物质（Ne、Ar、Kr 和 Xe）的相图。提出了一种选择熵和内能起点的方法。这种方法可以利用热量变量测试相应状态的原理。在给定的温度、压力和化学势坐标下，水的同素异形体形成一组物质，并具有相似的相图。相同坐标下的惰性物质组成另一组物质，具有相似的相图。具有重要德布尔量子参数的惰性 Ne 的相图与其他惰性物质的相图有一定程度的差异。
{"title":"Comparison of phase diagrams of H2O, D2O, and inert substances","authors":"L. A. Bulavin, Ye. G. Rudnikov, N. I. Lebovka","doi":"10.1063/10.0024971","DOIUrl":"https://doi.org/10.1063/10.0024971","url":null,"abstract":"The phase diagrams for the light H2O, heavy D2O water, and inert substances (Ne, Ar, Kr, and Xe) have been compared. A method of choosing the starting point for entropy and internal energy was proposed. It allowed testing the principle of corresponding states using caloric variables. In the given coordinates of temperature, pressure, and chemical potential, the water isotopologues form one group of substances and have similar phase diagrams. The inert substances in the same coordinates form another group of substances with similar phase diagrams. The phase diagrams for inert Ne with significant de Boer quantum parameters differ to a certain extent from the phase diagrams of other inert substances.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"33 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140315638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
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