Journal of Experimental and Theoretical Physics最新文献_第3页

Performance of Monte Carlo Event Generators of pp Collisions at NICA Energies NICA 能量下pp对撞蒙特卡洛事件发生器的性能

IF 1.1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-12 DOI: 10.1134/s106377612311002x

M. Yu. Azarkin, M. R. Kirakosyan

引用次数: 0

Spin States of Cobalt Ions and a Metal–Semiconductor Transition in Layered Cobaltites PrBaCo2O5 + δ (δ = 0.52, 0.74) 钴离子的自旋态和层状钴矿 PrBaCo2O5 + δ（δ = 0.52，0.74）中的金属-半导体转变

IF 1.1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-12 DOI: 10.1134/s1063776123110109

N. I. Solin, S. V. Naumov, A. V. Korolev, V. R. Galakhov

{"title":"Spin States of Cobalt Ions and a Metal–Semiconductor Transition in Layered Cobaltites PrBaCo2O5 + δ (δ = 0.52, 0.74)","authors":"N. I. Solin, S. V. Naumov, A. V. Korolev, V. R. Galakhov","doi":"10.1134/s1063776123110109","DOIUrl":"https://doi.org/10.1134/s1063776123110109","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3>The spin states of Co atoms in PrBaCo2O5 + δ with regard to the paramagnetic contribution of Pr3+ ions have been determined from magnetic property studies for δ = 0.52 and 0.74. Results obtained without considering the paramagnetic contribution of Pr3+ ions are inconsistent with available experimental data. With a decrease in temperature, the metal–insulator transition in PrBaCo2O5.52 becomes sharper according to a sharp change in spin states (from HS/LS to LS/IS) of Co3+ ions. In this case, Co3+ ions occupying octahedra pass from the high-spin state (HS, S = 2) to the low-spin one (LS, S = 0) and those occupying pyramids pass from the LS-state to the intermediate spin state (IS, S = 1), as follows from the available structural data. In PrBaCo2O5.74, the metal–semiconductor transition occurs smoothly from HS/LS to the HS/IS state upon the smooth transition of the Co3+ ion state from (LS, S = 0) to the (IS, S = 1) state in pyramides without change in the spin state of ions Co3+ (HS, S = 2) and Co4+ (LS, S = 1/2) in octahedrons.","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139462575","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

Asymptotic Theory of Solitons Generated from an Intense Wave Pulse 强波脉冲产生孤子的渐近理论

IF 1.1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-12 DOI: 10.1134/s1063776123110043

A. M. Kamchatnov

{"title":"Asymptotic Theory of Solitons Generated from an Intense Wave Pulse","authors":"A. M. Kamchatnov","doi":"10.1134/s1063776123110043","DOIUrl":"https://doi.org/10.1134/s1063776123110043","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3>A theory of conversion of an intense initial wave pulse into solitons for asymptotically long evolution times has been developed using the approach based on the fact that such a transformation occurs via an intermediate stage of formation and evolution of dispersion shock waves. The number of nonlinear oscillations in such waves turns out to be equal to the number of solitons in the asymptotic state. Using the Poincaré–Cartan integral invariant theory, it is shown that the number of oscillations equal to the classical action of a particle associated with the wave packet in the vicinity of the small-amplitude edge of a dispersion shock wave remains unchanged upon a transfer by a flow described by a nondispersive limit of the nonlinear wave equations considered here. This makes it possible to formulate a generalized Bohr–Sommerfeld quantization rule that determines the set of “eigenvalues” associated with soliton physical parameters in the asymptotic state (in particular, with their velocities). In the theory, the properties of full integrability of nonlinear wave equations are not used, but the corresponding results are reproduced in this case also. The analytical results are confirmed by numerical solutions to nonlinear wave equations.","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139462257","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

Effect of Heating on the Generation and Properties of Platicons in High-Q Optical Microresonators 加热对高 Q 值光学微谐振器中产生的静子及其特性的影响

IF 1.1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-12 DOI: 10.1134/s1063776123110055

V. E. Lobanov

{"title":"Effect of Heating on the Generation and Properties of Platicons in High-Q Optical Microresonators","authors":"V. E. Lobanov","doi":"10.1134/s1063776123110055","DOIUrl":"https://doi.org/10.1134/s1063776123110055","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3>Pumping a high-Q optical microresonator by an external laser is inevitably associated with thermal effects. They have a significant impact on the dynamics of nonlinear processes in such structures, including the generation of optical frequency combs and dissipative solitons. The generation process and the properties of bright solitons in such heated microresonators with anomalous group velocity dispersion (GVD) have been well studied, and a number of methods have been developed to minimize the effect of thermal processes. However, for dark solitons or platicons excited at normal GVD, these issues have been studied significantly less. In this work, the properties of platicons in heated microresonators are analyzed, and it is shown that in the case of “positive” thermal effects, when the direction of the thermal shift of the resonance frequencies of a microresonator coincides with the direction of the nonlinear shift, the widest high-energy platicons with the duration close to the round trip time in the resonator are stable. In the case of “negative” thermal effects, narrow low-energy platicons remain stable. Moreover, in microresonators with “negative” thermal effects, the interaction between cubic nonlinear and thermal processes can ensure the generation of platicons without special techniques required in other cases.","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139462259","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

Effect of Noise on Resistive Switching of an Yttria Stabilized Zirconia Based Memristor 噪声对基于钇稳定氧化锆的晶体管电阻开关的影响

IF 1.1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-12 DOI: 10.1134/s1063776123110031

O. N. Gorshkov, D. O. Filatov, M. N. Koriazhkina, V. A. Lobanova, M. A. Riabova

引用次数: 0

Phase Transitions in the Clock Model with q = 5 Spin States on a Triangular Lattice 三角形晶格上具有 q = 5 个自旋态的时钟模型中的相位转换

IF 1.1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-12 DOI: 10.1134/s1063776123110080

A. K. Murtazaev, M. K. Badiev, M. A. Magomedov, M. K. Ramazanov

引用次数: 0

Erratum to: Vortex Dynamics in Superconducting MoN Strip with a Side Cut 勘误：侧切超导氮化摩尔带中的涡旋动力学

IF 1.1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-12 DOI: 10.1134/s1063776123110171

S. S. Ustavschikov, M. Yu. Levichev, I. Yu. Pashen’kin, N. S. Gusev, S. A. Gusev, D. Yu. Vodolazov

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 1.1 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":"https://doi.org/10.1134/s1063776123110018","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3>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":null,"pages":null},"PeriodicalIF":1.1,"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 1.1 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 1.1 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":"https://doi.org/10.1134/s1063776123110079","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3>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":null,"pages":null},"PeriodicalIF":1.1,"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