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Magnetocaloric effect in UTe2: Theory predictions 碲化镉(UTe2)中的磁ocaloric效应：理论预测
IF 0.8 4区 物理与天体物理
Low Temperature Physics Pub Date : 2024-07-19 DOI: 10.1063/10.0026281
A. A. Zvyagin, G. A. Zvyagina
{"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}
引用次数: 0
Phonon hydrodynamics in bulk insulators and semimetals 块状绝缘体和半金属中的声子流体力学
IF 0.8 4区 物理与天体物理
Low Temperature Physics Pub Date : 2024-07-19 DOI: 10.1063/10.0026323
Yo Machida, Valentina Martelli, Alexandre Jaoui, Benoît Fauqué, Kamran Behnia
{"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}
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 > 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}
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
{"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}
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
{"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}
引用次数: 0
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? 利用真空升华低温沉积法获得的水合富勒烯 C60 分子胶体溶液的拉曼、紫外可见光、质谱和红外特性。C60 分子是否真的高度疏水？
IF 0.8 4区 物理与天体物理
Low Temperature Physics Pub Date : 2024-03-26 DOI: 10.1063/10.0024965
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
{"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}
引用次数: 0
Structural studies of amorphous polymer films: Experiment and calculation 无定形聚合物薄膜的结构研究：实验与计算
IF 0.8 4区 物理与天体物理
Low Temperature Physics Pub Date : 2024-03-26 DOI: 10.1063/10.0024972
D. E. Hurova, V. G. Geidarov, I. S. Braude, N. A. Aksenova, S. G. Stepanian, L. Adamowicz, N. N. Galtsov
{"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}
引用次数: 0
Advantages of the low-temperature secondary emission mass spectrometry in analysis of metal ions in water samples revisited 再论低温二次发射质谱法分析水样中金属离子的优势
IF 0.8 4区 物理与天体物理
Low Temperature Physics Pub Date : 2024-03-26 DOI: 10.1063/10.0024963
O. A. Boryak, V. S. Shelkovsky, V. V. Orlov, V. G. Zobnina, M. V. Kosevich
{"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}
引用次数: 0
Enhanced DNA Raman modes probed by SiO2 photonic crystals 利用二氧化硅光子晶体探测增强的 DNA 拉曼模式
IF 0.8 4区 物理与天体物理
Low Temperature Physics Pub Date : 2024-03-26 DOI: 10.1063/10.0024964
M. Olenchuk, T. Hanulia, A. Nikolenko, G. Dovbeshko
{"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}
引用次数: 0
Comparison of phase diagrams of H2O, D2O, and inert substances H2O、D2O 和惰性物质相图的比较
IF 0.8 4区 物理与天体物理
Low Temperature Physics Pub Date : 2024-03-26 DOI: 10.1063/10.0024971
L. A. Bulavin, Ye. G. Rudnikov, N. I. Lebovka
{"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}
引用次数: 0
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