Low Temperature Physics最新文献_第5页

Short notes: Inversion of exchange interaction sign of Nd3+ excited states and its manifestation in optical absorption spectra of NdFe3(BO3)4 crystal 简短说明：Nd3+ 激发态交换相互作用符号的反转及其在 NdFe3(BO3)4 晶体光学吸收光谱中的体现

IF 0.8 4区物理与天体物理

Low Temperature Physics Pub Date : 2024-05-01 DOI: 10.1063/10.0025636

I. Kachur, V. S. Kurnosov, V. G. Piryatinskaya

引用次数: 0

Manifestation of the Aharonov–Bohm effect in hydrodynamic instability of an electron beam moving along a semiconductor nanotube 阿哈诺夫-玻姆效应在电子束沿半导体纳米管运动的流体力学不稳定性中的体现

IF 0.8 4区物理与天体物理

Low Temperature Physics Pub Date : 2024-05-01 DOI: 10.1063/10.0025623

Y. Averkov, Yu. V. Prokopenko, V. Yampol’skii

{"title":"Manifestation of the Aharonov–Bohm effect in hydrodynamic instability of an electron beam moving along a semiconductor nanotube","authors":"Y. Averkov, Yu. V. Prokopenko, V. Yampol’skii","doi":"10.1063/10.0025623","DOIUrl":"https://doi.org/10.1063/10.0025623","url":null,"abstract":"We theoretically study a manifestation of the Aharonov–Bohm effect in hydrodynamic instability of a tubular nonrelativistic electron beam moving along a semiconductor nanotube with dielectric filling placed in a coaxial dc magnetic field. The calculations are performed with taking into account the retardation effect for electromagnetic fields. The dispersion equation for the coupled waves of the structure under study and the electron beam, as well as the expression for the increment of the hydrodynamic instability have been derived and numerically analyzed. The mechanism of nonlinear stabilization of the hybrid bulk-surface and surface electromagnetic waves is studied by the method of slowly varying in time amplitudes and phases. The physical cause of excitation of such waves is the Cherenkov resonance, and the nonlinear stabilization mechanism is based on the trapping of beam particles by the field of the excited wave. The numerical analysis shows that the time of saturation of the instability and the maximum field amplitudes depend on the number of magnetic flux quanta in the nanotube and changes with the period equal to one magnetic flux quantum. These dependences are the result of the Aharonov–Bohm effect.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141038919","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}

引用次数: 0

Low-temperature electrical conductivity of ion-beam irradiated Bi–Sb films 离子束辐照铋-锑薄膜的低温导电性

IF 0.8 4区物理与天体物理

Low Temperature Physics Pub Date : 2024-05-01 DOI: 10.1063/10.0025622

A. Andrino-Gómez, M. Moratalla, A. Redondo-Cubero, N. Gordillo, M. A. Ramos

{"title":"Low-temperature electrical conductivity of ion-beam irradiated Bi–Sb films","authors":"A. Andrino-Gómez, M. Moratalla, A. Redondo-Cubero, N. Gordillo, M. A. Ramos","doi":"10.1063/10.0025622","DOIUrl":"https://doi.org/10.1063/10.0025622","url":null,"abstract":"Bismuth-antimony alloys are among the most studied topological insulators and also have very promising thermoelectric properties. In addition, in the amorphous state they exhibit superconductivity with critical temperatures in the range 6.0–6.4 K. In this work, we have prepared and studied different polycrystalline films of Bi100–xSbx (x = 0, 5, 10, 15), and we have induced, through ion beam irradiation, significant damage in their internal structure with the aim of amorphizing the material. Specifically, we have irradiated Bi ions in the 10–30 MeV range, exploiting the capabilities of a 5 MV ion beam accelerator of tandem type. We have characterized the Bi–Sb films before and after irradiation from a morphological and structural point of view and measured their electrical resistivity from room temperature to near 2 K, to evaluate the influence of the preparation method and degree of disorder. We have found that the studied Bi–Sb system always behaves as a small energy gap semiconductor that follows the empirical Meyer–Neldel rule, which correlates the conductivity prefactor with the exponential value of the energy gap.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141028747","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}

引用次数: 0

Evolution of the pseudogap temperature dependence in YBa2Cu3O7–δ films under the influence of a magnetic field 磁场影响下 YBa2Cu3O7-δ 薄膜的伪间隙温度依赖性演变

IF 0.8 4区物理与天体物理

Low Temperature Physics Pub Date : 2024-04-25 DOI: 10.1063/10.0025295

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

{"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 &gt; 5 T. Moreover, above the Ginzburg temperature TG, which limits superconducting fluctuations from below, for B &gt; 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":null,"pages":null},"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}

引用次数: 0

Features of nanocontact formed using point electrical breakdown of a niobium oxide nanolayer 利用点电击穿氧化铌纳米层形成的纳米触头的特征

IF 0.8 4区物理与天体物理

Low Temperature Physics Pub Date : 2024-04-25 DOI: 10.1063/10.0025302

S. I. Bondarenko, A. V. Krevsun, V. P. Koverya

引用次数: 0

Effective cross-plane thermal conductivity of metal-dielectric multilayers at low temperatures 金属-电介质多层膜在低温下的有效跨面热导率

IF 0.8 4区物理与天体物理

Low Temperature Physics Pub Date : 2024-04-25 DOI: 10.1063/10.0025298

A. I. Bezuglyj, I. V. Mironenko, V. A. Shklovskij

引用次数: 0

On the specific behavior of the work function and surface potential of an asymmetric metal-dielectric nanosandwich 关于非对称金属电介质纳米夹层的功函数和表面电势的特定行为

IF 0.8 4区物理与天体物理

Low Temperature Physics Pub Date : 2024-04-01 DOI: 10.1063/10.0025300

V. Pogosov

{"title":"On the specific behavior of the work function and surface potential of an asymmetric metal-dielectric nanosandwich","authors":"V. Pogosov","doi":"10.1063/10.0025300","DOIUrl":"https://doi.org/10.1063/10.0025300","url":null,"abstract":"We examine thin film on a dielectric substrate (vacuum/Al/SiO2) in the stabilized jellium model and the Kohn–Sham method. We investigate surface and size effects on the effective potential and the electron work function, and analyze the spatial distributions of electrons and potentials. It is found that a dielectric environment generally leads to a decrease in the work function. The effect of dielectric confinement for the electron work function of the asymmetric metal-dielectric nanosandwiches is reduced only by the surface area weighted average value of the dielectric constants. This conclusion follows from the application of the Gauss theorem for a conducting sphere with an inhomogeneous dielectric coating. The flow of electrons from the dielectric face to the vacuum one due to the contact potential difference manifests itself in the appearance of an additional dipole between the left and right face within the spatial distributions of ions. This leads to the fact that in a vacuum the electrostatic and effective potentials change sign twice, as a result of which a potential barrier appears above the vacuum level. We introduced the position of an electron conduction band in the dielectric as the input parameter in the self-consistency procedure for one of the sandwich approximations. As it turned out, the barrier height depends only on the used local or non-local approximation of the exchange-correlation energy. The nontrivial origin and behavior of the calculated effective potential on the vacuum side of the film, as well as the reasons for it, are discussed.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140779920","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}

引用次数: 0

Electric and elastic characteristics of the orthorhombic paramagnet after the quantum quench 量子淬火后正交顺磁体的电特性和弹性特性

IF 0.8 4区物理与天体物理

Low Temperature Physics Pub Date : 2024-04-01 DOI: 10.1063/10.0025296

A. A. Zvyagin, G. A. Zvyagina

引用次数: 0

Empirical universal approach to describing the thermal conductivity of amorphous polymers: Effects of pressure, radiation and the Meyer–Neldel rule 描述无定形聚合物导热性的经验通用方法：压力、辐射和 Meyer-Neldel 规则的影响

IF 0.8 4区物理与天体物理

Low Temperature Physics Pub Date : 2024-04-01 DOI: 10.1063/10.0025299

A. Krivchikov, O. A. Korolyuk

{"title":"Empirical universal approach to describing the thermal conductivity of amorphous polymers: Effects of pressure, radiation and the Meyer–Neldel rule","authors":"A. Krivchikov, O. A. Korolyuk","doi":"10.1063/10.0025299","DOIUrl":"https://doi.org/10.1063/10.0025299","url":null,"abstract":"In this study, we propose and validate a universal temperature-dependent model for characterizing the thermal conductivity of amorphous polymers over a wide temperature range. Our approach captures key features in the thermal conductivity data, including a plateau, an inflection point, and the subsequent increase and saturation with rising temperature. Importantly, this model proves effective not only for pristine amorphous polymers but also for polymers subjected to external influences. We investigate the temperature-dependent thermal conductivity of amorphous polymer materials under various external conditions, such as hydrostatic pressure, radiation exposure, and the incorporation of fillers. Our analysis reveals novel insights into the dual-channel heat transfer mechanisms within amorphous polymers. Specifically, we observe a linear relationship between the logarithm of the “coherence” conductivity pre-factor and the characteristic energy, consistent with the Meyer–Neldel rule governing thermal conductivity. This research advances our understanding of thermal transport in amorphous polymers and underscores the applicability of the proposed universal model in describing complex thermal behavior across different conditions.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140777256","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}

引用次数: 0

Strong zero modes and edge states in the interacting fermion chain without pairing 无配对相互作用费米子链中的强零模式和边缘状态

IF 0.8 4区物理与天体物理

Low Temperature Physics Pub Date : 2024-04-01 DOI: 10.1063/10.0025297

A. A. Zvyagin

引用次数: 0