JETP Letters最新文献

Structural Diversity and Phase Transitions in Mg2 – xMn1 + xBO5 (x = 0.0, 0.2, 0.4) Borates with a Mixed Valence 混合价硼酸盐 Mg2 - xMn1 + xBO5 (x = 0.0, 0.2, 0.4) 中的结构多样性和相变

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2024-11-12 DOI: 10.1134/S0021364024603075

N. A. Belskaya, N. V. Kazak, A. D. Vasiliev, E. V. Eremin, E. M. Moshkina, D. A. Velikanov, L. N. Bezmaternykh, S. Yu. Gavrilkin, S. G. Ovchinnikov

{"title":"Structural Diversity and Phase Transitions in Mg2 – xMn1 + xBO5 (x = 0.0, 0.2, 0.4) Borates with a Mixed Valence","authors":"N. A. Belskaya, N. V. Kazak, A. D. Vasiliev, E. V. Eremin, E. M. Moshkina, D. A. Velikanov, L. N. Bezmaternykh, S. Yu. Gavrilkin, S. G. Ovchinnikov","doi":"10.1134/S0021364024603075","DOIUrl":"10.1134/S0021364024603075","url":null,"abstract":"Single and polycrystalline samples of Mg2 – xMn1 + xBO5 (x = 0.0, 0.2, 0.4) oxyborates have been obtained for the first time by spontaneous crystallization from the solution–melt and through a solid-state reaction. X-ray diffraction studies have shown that compounds are crystallized with increasing manganese content in the ludwigite (space group Pbam)–hulsite (space group P2/m)–orthopinakiolite (space group Pbam) series and belong to the “3 Å wallpaper” borate family. A common property of materials is the presence of octahedral complexes (walls) consisting of manganese ions with a mixed valence at even crystallographic sites. The dc magnetization and specific heat of the Mg2 – xMn1 + xBO5 (x = 0.0, 0.2, 0.4) compounds have been studied for the first time. These studies have shown that cooling is accompanied by magnetic transitions, which are due to the ordering of several magnetic subsystems.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 7","pages":"509 - 516"},"PeriodicalIF":1.4,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142600622","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

Bound States of High-Order Magnetic Skyrmions and a Superconducting Pearl Vortex 高阶磁性 Skyrmions 和超导珍珠涡旋的边界态

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2024-11-12 DOI: 10.1134/S0021364024602896

A. D. Fedoseev, M. S. Shustin, D. M. Dzebisashvili

引用次数: 0

Ramsey Spectroscopy of CPT Resonances on the D1 Line of Alkali Metal Atoms in Miniature Cells in the Field of Counterpropagating Waves with Opposite Circular Polarizations 微型电池中碱金属原子 D1 线的 CPT 共振在相反圆极化反向传播波场中的拉姆齐光谱分析

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2024-11-12 DOI: 10.1134/S0021364024603130

V. I. Yudin, M. Yu. Basalaev, D. A. Radnatarov, I. V. Gromov, M. D. Radchenko, S. M. Kobtsev, A. V. Taichenachev

{"title":"Ramsey Spectroscopy of CPT Resonances on the D1 Line of Alkali Metal Atoms in Miniature Cells in the Field of Counterpropagating Waves with Opposite Circular Polarizations","authors":"V. I. Yudin, M. Yu. Basalaev, D. A. Radnatarov, I. V. Gromov, M. D. Radchenko, S. M. Kobtsev, A. V. Taichenachev","doi":"10.1134/S0021364024603130","DOIUrl":"10.1134/S0021364024603130","url":null,"abstract":"In this study, the Ramsey spectroscopy of coherent population trapping resonances excited on the D1 line of alkali metal atoms in miniature vapor cells has been studied theoretically and experimentally. The configuration of the field produced by two counterpropagating waves with opposite circular polarizations has been considered. A counterpropagating wave is formed as a result of reflection from a partially transmitting output mirror, while the signal from the initial wave transmitted through the mirror is detected. It is shown that such a scheme is characterized by the optimal mirror reflection coefficient, for which the short-term stability can be substantially improved relative to the standard scheme without the counterpropagating wave. The three-fold improvement of the short-term stability of the atomic clock based on the coherent population trapping resonance in a vapor cell with 87Rb atoms has been demonstrated experimentally.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 7","pages":"477 - 482"},"PeriodicalIF":1.4,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142600620","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

Photovoltaic Hall Effect in Two-Dimensional Fluctuating Superconductors 二维波动超导体中的光电霍尔效应

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2024-11-12 DOI: 10.1134/S002136402460294X

M. V. Boev, V. M. Kovalev

引用次数: 0

Electron Acceleration in Nitrogen Clusters by Terawatt Femtosecond Laser 用兆瓦级飞秒激光对氮簇中的电子进行加速

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2024-11-12 DOI: 10.1134/S0021364024601957

M. M. Nazarov, T. A. Semenov, A. A. Tausenev, M. V. Chaschin, P. A. Shcheglov, A. V. Lazarev, D. A. Sidorov-Biryukov, A. V. Mitrofanov, V. M. Gordienko, V. Ya. Panchenko

引用次数: 0

On the Equivalence of Phase and Polarization Transformations in Quantum Optics 论量子光学中相位变换和偏振变换的等效性

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2024-11-12 DOI: 10.1134/S002136402460318X

S. N. Molotkov, I. S. Sushchev

引用次数: 0

Alternative Idea About the Source of the Baryon Asymmetry of the Universe 关于宇宙重子不对称来源的另一种观点

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2024-11-12 DOI: 10.1134/S0021364024603312

S. N. Vergeles

{"title":"Alternative Idea About the Source of the Baryon Asymmetry of the Universe","authors":"S. N. Vergeles","doi":"10.1134/S0021364024603312","DOIUrl":"10.1134/S0021364024603312","url":null,"abstract":"The paper proposes an alternative scenario for the emergence of the baryon asymmetry of the Universe. This scenario is realized in the lattice gravity model associated with the Dirac field as follows. At ultrahigh temperatures of the Grand Unification order ({{T}_{c}} sim {{10}^{{18}}}) GeV and higher, the system is in a PT-symmetric phase. But when the temperature decreases, a phase transition to an asymmetric phase occurs, in which a non-zero tetrad appears, that is, space-time with the Minkowski metric, and the system’s wavefunction splits into two: (|,rangle = {text{|}} + rangle + ,{text{|}} - rangle ). The fields of tetrads in states ({text{|}} + rangle ) and ({text{|}} - rangle ) differ in sign. At the very first moment of time with a duration of the order of the Planck time, a transition of fermions between these states is possible. These transitions in different parts of space are not correlated with each other. Therefore, the final asymmetry of the fermion charge between these states is relatively extremely small and it is preserved in time, since the interaction of the states ({text{|}} + rangle ) and ({text{|}} - rangle ) ceases at times greater than the Planck time.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 7","pages":"461 - 469"},"PeriodicalIF":1.4,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024603312.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142600617","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantum Accelerometry Based on a Geometric Phase 基于几何相位的量子加速度计

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2024-11-12 DOI: 10.1134/S0021364024602471

A. M. Rostom, V. A. Tomilin, L. V. Il’ichev

引用次数: 0

Features of the Structure of Spark Channels in a Near-Cathode Region 近阴极区火花通道结构的特点

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2024-11-12 DOI: 10.1134/S0021364024602951

E. V. Parkevich

引用次数: 0

Synchronous Detection of Nonlinear Phenomena in Opto-Acoustic Vibrations Induced in a Nanofilm by a Femtosecond Laser Pulse 同步检测飞秒激光脉冲在纳米薄膜中诱导的光声振动中的非线性现象

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2024-11-12 DOI: 10.1134/S0021364024603208

V. A. Khokhlov, S. A. Romashevskiy, S. I. Ashitkov, N. A. Inogamov

{"title":"Synchronous Detection of Nonlinear Phenomena in Opto-Acoustic Vibrations Induced in a Nanofilm by a Femtosecond Laser Pulse","authors":"V. A. Khokhlov, S. A. Romashevskiy, S. I. Ashitkov, N. A. Inogamov","doi":"10.1134/S0021364024603208","DOIUrl":"10.1134/S0021364024603208","url":null,"abstract":"Studies of the laser-induced ultrafast processes in thin films are of significant importance for the development of microelectronics. These processes include the heating of an electron subsystem, relaxation and transport of the absorbed energy, and generation and propagation of picosecond acoustic waves. In view of this circumstance, to study the dynamics of variation of the differential reflection coefficient ΔR(t)/R0 of a 73-nm-thick Ni film on a glass substrate, pump–probe measurements have been performed in this work with the synchronous detection of a ΔR(t)/R0 signal. High absorbed fluences up to 11 mJ/cm2 have been reached by increasing the pulse-repetition interval tcool of heating (pump) pulses. An increase in tcool makes it possible to better cool the film after heating. As a result, record temperatures Te ≈ 3 kK and Ti ≈ 1 kK and stresses up to 7 GPa have been reached for the first time to the best of our knowledge. These high values have allowed the observation of nonlinear effects for the first time in experiments with synchronous detection.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 7","pages":"531 - 539"},"PeriodicalIF":1.4,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142600615","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