Journal of Experimental and Theoretical Physics最新文献_第5页

Influence of the Effects of Competition of Various Types of Anisotropy on the Critical Behavior of Magnetic Multilayer Structures 各种类型的各向异性竞争对磁性多层结构临界行为的影响

IF 1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-12 DOI: 10.1134/S1063776123110158

A. V. Min’kova, V. V. Prudnikov, P. V. Prudnikov

{"title":"Influence of the Effects of Competition of Various Types of Anisotropy on the Critical Behavior of Magnetic Multilayer Structures","authors":"A. V. Min’kova, V. V. Prudnikov, P. V. Prudnikov","doi":"10.1134/S1063776123110158","DOIUrl":"10.1134/S1063776123110158","url":null,"abstract":"The influence of the competition of single-ion anisotropy and easy-plane anisotropy on the magnetic properties of the multilayer structure Co/Cu/Co is investigated. The peculiarities of the influence of anisotropy effects are revealed both in the vicinity of critical temperature Tc and in the low-temperature range T ( ll ) Tc. The magnetic properties of the multilayer structure are numerically simulated using the anisotropic Heisenberg model. In the vicinity of Tc, easy-plane anisotropy is shown to exert a predominant influence on the magnetic properties of the structure as compared to the influence of single-ion anisotropy. In the low-temperature range, the switching of the magnetic state of the ferromagnetic film in an external field leads to the appearance of specific features in hysteresis effects due to the competition of two types of magnetic anisotropy. The magnetic structure exhibits a size-induced transition from the behavior caused by easy-plane anisotropy to the behavior caused by single-ion anisotropy. The revealed size-induced transition is accompanied by a spin-flop effect.","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"137 5","pages":"675 - 681"},"PeriodicalIF":1.0,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139462256","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

Spin Glass Model for GaAs/AlGaAs Quantum Wells Doped by Nonmagnetic Impurities near the Metal-Insulator Transition 金属-绝缘体转变附近非磁性杂质掺杂的砷化镓/砷化镓量子阱的自旋玻璃模型

IF 1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-12 DOI: 10.1134/S1063776123110018

N. V. Agrinskaya, V. I. Kozub

{"title":"Spin Glass Model for GaAs/AlGaAs Quantum Wells Doped by Nonmagnetic Impurities near the Metal-Insulator Transition","authors":"N. V. Agrinskaya, V. I. Kozub","doi":"10.1134/S1063776123110018","DOIUrl":"10.1134/S1063776123110018","url":null,"abstract":"In a previous report, we presented experiments which suggested that ferromagnetic ordering of the spins of localized holes in GaAs/AlGaAs quantum wells could be observed when doped with shallow (Be) acceptors at impurity concentrations near the metal-insulator transition. The compensating impurity (Si) was introduced into a narrow region at the center of the barriers [4]. In this paper, we present results from magnetotransport experiments performed on similar structures, but without the compensating impurity (Si). In these samples, the compensation degree is expected to be controlled by the background defects located at the edges of the quantum wells and within the barriers. At low temperatures T ≤ 10 K, we observed isotropic, linear magnetoresistance, anomalous behavior of the Hall effect as a function of the magnetic field, and slow relaxation of resistance after the application of a magnetic field. We explain this anomalous magnetotransport as the manifestation of a ferromagnetic transition or spin glass, originating from indirect spin exchange between localized holes on impurities near the metal-insulator transition. However, we note that perfect disorder, including signs of interspin interactions, leads to unstable configurations. In what follows, we present a model in which we start with this perfect disorder, but apply a procedure to obtain a stable configuration. We show that the resulting spin structure, a “closely packed” structure of “droplets,” can reproduce the features observed in the experiment, particularly isotropic, linear magnetoresistance.","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"137 5","pages":"688 - 694"},"PeriodicalIF":1.0,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139462225","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

Ghost Imaging in a Fiber-Optic Endoscope Based on Light Scattering 基于光散射的光纤内窥镜鬼影成像技术

IF 1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-12 DOI: 10.1134/S1063776123110122

D. P. Agapov, I. V. Belovolov, S. A. Magnitskii, D. N. Frolovtsev, A. S. Chirkin

引用次数: 0

Lifshitz Transitions and Angular Conductivity Diagrams in Metals with Complex Fermi Surfaces 具有复杂费米面的金属中的利夫希茨转变和角传导图

IF 1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-12 DOI: 10.1134/S1063776123110079

A. Ya. Maltsev

{"title":"Lifshitz Transitions and Angular Conductivity Diagrams in Metals with Complex Fermi Surfaces","authors":"A. Ya. Maltsev","doi":"10.1134/S1063776123110079","DOIUrl":"10.1134/S1063776123110079","url":null,"abstract":"We consider the Lifshitz topological transitions and the corresponding changes in the galvano-magnetic properties of a metal from the point of view of the general classification of open electron trajectories arising on Fermi surfaces of arbitrary complexity in the presence of magnetic field. The construction of such a classification is the content of the Novikov problem and is based on the division of non-closed electron trajectories into topologically regular and chaotic trajectories. The description of stable topologically regular trajectories gives a basis for a complete classification of non-closed trajectories on arbitrary Fermi surfaces and is connected with special topological structures on these surfaces. Using this description, we describe here the distinctive features of possible changes in the picture of electron trajectories during the Lifshitz transitions, as well as changes in the conductivity behavior in the presence of a strong magnetic field. As it turns out, the use of such an approach makes it possible to describe not only the changes associated with stable electron trajectories, but also the most general changes of the conductivity diagram in strong magnetic fields.","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"137 5","pages":"706 - 724"},"PeriodicalIF":1.0,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139465276","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

Hydraulic Jump for Planar and Axisymmetric Flow of a Fluid Layer 流体层平面和轴对称流动的水力跳动

IF 1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-12 DOI: 10.1134/S1063776123110110

A. D. Sukhov, A. G. Petrov

引用次数: 0

Spin Transfer Torque and Nonlinear Quantum Electron Transport in Chiral Helimagnets 手性螺旋磁体中的自旋传递扭矩和非线性量子电子传输

IF 1.1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2023-12-10 DOI: 10.1134/s1063776123100126

V. V. Ustinov, I. A. Yasyulevich

引用次数: 0

Bragg Resonances in a Multiferroic Double-Nonlinearity Crystal 多铁性双非线性晶体中的布拉格共振

IF 1.1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2023-12-10 DOI: 10.1134/s1063776123100060

M. A. Morozova, O. V. Matveev, D. V. Romanenko, S. A. Nikitov

引用次数: 0

Antiferromagnetic Excitonic Insulator 反铁磁励磁绝缘体

IF 1.1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2023-12-10 DOI: 10.1134/s1063776123100138

V. V. Val’kov

{"title":"Antiferromagnetic Excitonic Insulator","authors":"V. V. Val’kov","doi":"10.1134/s1063776123100138","DOIUrl":"https://doi.org/10.1134/s1063776123100138","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3>The effective the two-band Hamiltonian is obtained for iridium oxides with account for strong electron correlations (SEC) and the spin–orbit interaction. The intraatomic electron correlations in iridium ions induce the formation of Hubbard fermions (HF) filling the states in the valence band. Another consequence of SEC is associated with the emergence of the antiferromagnetic (AFM) exchange interaction between HF in accordance with the Anderson mechanism. As a result, a long-range antiferromagnetic order is established in the system, and in the conditions of band overlapping, the intersite Coulomb interaction induces a phase transition to the excitonic insulator (EI) state with a long-range AFM order. The system of integral self-consistent equations, the solution to which determines the excitonic order parameter components Δi, j(k), sublattice magnetization M, Hubbard fermion concentration nd, and chemical potential μ, is obtained using the atomic representation, the method of two-time temperature Green’s functions, and the Zwanzig–Mori projection technique. The symmetry classification of AFM EI phases is performed, and it is shown that in the nearest neighbor approximation, state Δi, j(k) with the s-type symmetry corresponds to the ground state, while the phases with the d- and p-symmetries are metastable.","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"208 1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138569798","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

Optical Linear Dichroism in the ab-Plane of NdFe3(BO3)4 Ferroborate NdFe3(BO3)4 铁硼酸盐 ab 平面上的光学线性二色性

IF 1.1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2023-12-10 DOI: 10.1134/s1063776123100011

K. N. Boldyrev, M. Diab, I. A. Gudim, M. N. Popova

{"title":"Optical Linear Dichroism in the ab-Plane of NdFe3(BO3)4 Ferroborate","authors":"K. N. Boldyrev, M. Diab, I. A. Gudim, M. N. Popova","doi":"10.1134/s1063776123100011","DOIUrl":"https://doi.org/10.1134/s1063776123100011","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3>The high-resolution optical absorption spectra of NdFe3(BO3)4 single crystals have been recorded at temperatures from 4 to 40 K in the IR range of f–f transitions in a Nd3+ ion. Light linearly polarized at different angles to the C2 axes in the basal plane has been passed along the trigonal C3 axis. Below the temperature of magnetic moment ordering into a collinear antiferromagnetic structure (TN ≈ 30 K), dichroism, that is, the absorption versus polarization dependence, arises. The temperature and angular dependences of dichroism indicate that the magnetic moments of iron are directed along the C2 axes up to about 17 K, the number of domains with variously directed C2 axes being different. The mechanism of linear dichroism has been discussed. Below 17 K, a smooth transition to the helicoidal magnetic phase has been observed, with the collinear phase coexisting with the helicoidal one. Data presented in this article contradict the earlier concept of magnetic moments fluctuating in the low-temperature phase near the C2 axis within the ±10° interval.","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"35 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138569413","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

Magnetic Properties of the Double Perovskite Sr2CrNbO6 双包晶石 Sr2CrNbO6 的磁性能

IF 1.1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2023-12-10 DOI: 10.1134/s1063776123100096

D. V. Popov, R. G. Batulin, M. A. Cherosov, I. V. Yatsyk, T. I. Chupakhina, Yu. A. Deeva, I. I. Fazlizhanov, R. M. Eremina, T. Maiti

引用次数: 0