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Phase Transitions in Heisenberg Magnets Induced by Uniaxial Anisotropy: Wang–Landau and Machine Learning Simulations 由单轴各向异性诱导的海森堡磁体相变：Wang-Landau和机器学习模拟
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-09-12 DOI: 10.1134/S0021364025607080
D. A. Druz’ev, A. A. Chubarova, P. V. Prudnikov
{"title":"Phase Transitions in Heisenberg Magnets Induced by Uniaxial Anisotropy: Wang–Landau and Machine Learning Simulations","authors":"D. A. Druz’ev,&nbsp;A. A. Chubarova,&nbsp;P. V. Prudnikov","doi":"10.1134/S0021364025607080","DOIUrl":"10.1134/S0021364025607080","url":null,"abstract":"<p>The critical properties of a three-dimensional anisotropic Heisenberg model in an external field has been simulated for the first time using an approach combining the Wang–Landau algorithm with machine learning methods, DBSCAN clustering, and principal component analysis. The threshold value of the parameter Δ<sub>c</sub> separating the regions of the decisive effect of uniaxial anisotropy has been determined.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"122 3","pages":"165 - 170"},"PeriodicalIF":1.3,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145037480","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
Resonant Inelastic X-Ray Scattering at Fe L2, 3 Absorption Edges of SrFeOx Oxides (x = 2.46 and 2.82) SrFeOx氧化物（x = 2.46和2.82）Fe L2, 3吸收边的非弹性x射线共振散射
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-09-12 DOI: 10.1134/S0021364025606529
V. R. Galakhov, K. Kuepper
{"title":"Resonant Inelastic X-Ray Scattering at Fe L2, 3 Absorption Edges of SrFeOx Oxides (x = 2.46 and 2.82)","authors":"V. R. Galakhov,&nbsp;K. Kuepper","doi":"10.1134/S0021364025606529","DOIUrl":"10.1134/S0021364025606529","url":null,"abstract":"<p>Resonant inelastic X-ray scattering (RIXS) spectra at Fe <span>({{L}_{{2,3}}})</span> absorption edges are used to study the electronic structure of SrFeO<sub>2.46</sub> and SrFeO<sub>2.82</sub>. The RIXS spectra of SrFeO<sub>2.82</sub> in comparison with those of SrFeO<sub>2.46</sub> are characterized by less intense elastic recombination peaks and less pronounced inelastic spectral features, which is associated with a lower degree of localization of <span>({{d}^{4}} + {{d}^{5}}underline L )</span> states compared to <span>({{d}^{5}})</span> states. The inelastic scattering features of the RIXS spectra are attributed to <i>d</i>–<i>d</i> excitations. At higher excitation energies, where the continuum-excited fluorescence becomes dominant, the X-ray emission spectra are in good agreement with the measurement results of the photoelectron spectra of the valence bands of both SrFeO<sub>2.46</sub> and SrFeO<sub>2.82</sub>. It is shown that Tanabe–Sugano diagrams can be used to interpret the RIXS spectra of the SrFeO<sub>2.46</sub> ferrite with trivalent iron ions located both in octahedra and in tetrahedra of oxygen ions.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"122 3","pages":"184 - 189"},"PeriodicalIF":1.3,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025606529.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145037218","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
Superluminescence During the Filamentation of 950-nm Femtosecond Laser Pulses in Carbon Dioxide 950 nm飞秒激光脉冲在二氧化碳中成丝过程中的超发光
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-09-04 DOI: 10.1134/S0021364025606694
Ya. V. Grudtsyn, A. A. Ionin, I. O. Kinyaevsky, Yu. M. Klimachev, A. V. Koribut
{"title":"Superluminescence During the Filamentation of 950-nm Femtosecond Laser Pulses in Carbon Dioxide","authors":"Ya. V. Grudtsyn,&nbsp;A. A. Ionin,&nbsp;I. O. Kinyaevsky,&nbsp;Yu. M. Klimachev,&nbsp;A. V. Koribut","doi":"10.1134/S0021364025606694","DOIUrl":"10.1134/S0021364025606694","url":null,"abstract":"<p>Directional superluminescence on a large number of spectral lines in the wavelength range of 310–470 nm has been obtained during the filamentation of 950-nm femtosecond radiation from a Ti:sapphire laser in carbon dioxide. The lines have been identified as transition lines between the vibrational levels of electron-excited A<sup>2</sup>Π<sub>u</sub> and X<sup>2</sup>Π<sub>g</sub> states of CO<span>(_{2}^{ + })</span> ions. The effect of the pressure on the radiation spectrum has been studied and mechanisms of the observed phenomenon are discussed.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"122 2","pages":"79 - 84"},"PeriodicalIF":1.3,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025606694.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144990619","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
Thermal Stability of Spin Defects in a 6H-SiC Crystal According to Photoluminescence and Electron Paramagnetic Resonance Data 基于光致发光和电子顺磁共振数据的6H-SiC晶体自旋缺陷热稳定性研究
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-09-04 DOI: 10.1134/S002136402560750X
Yu. E. Ermakova, I. N. Gracheva, F. F. Murzakhanov, A. N. Smirnov, I. A. Eliseyev, O. P. Kazarova, G. V. Mamin, M. R. Gafurov
{"title":"Thermal Stability of Spin Defects in a 6H-SiC Crystal According to Photoluminescence and Electron Paramagnetic Resonance Data","authors":"Yu. E. Ermakova,&nbsp;I. N. Gracheva,&nbsp;F. F. Murzakhanov,&nbsp;A. N. Smirnov,&nbsp;I. A. Eliseyev,&nbsp;O. P. Kazarova,&nbsp;G. V. Mamin,&nbsp;M. R. Gafurov","doi":"10.1134/S002136402560750X","DOIUrl":"10.1134/S002136402560750X","url":null,"abstract":"<p>The spin and optical properties of two main types of spin defects (nitrogen vacancy (NV) centers and divacancies) in an isotopically purified crystal 6<i>H</i>-<sup>28</sup>SiC at different temperatures of the sample have been studied using the high-frequency electron paramagnetic resonance method and the luminescence analysis. It has been established that the ratio of the intensity of electron paramagnetic resonance signals from divacancies to the intensity of signals from NV defects decreases monotonically with an increase in the crystal temperature from 40 to 140 K, and signals from divacancies are no longer observed at temperatures above 140 K. The analysis of the optical characteristics of defects under the variation of the crystal temperature and the determination of activation energies have shown that all types of color centers, regardless of their position in the crystal lattice and the type of symmetry (<i>C</i><sub>1<i>h</i></sub> and <span>({{C}_{{3{v}}}})</span>), have a mechanism for thermal quenching of luminescence. The obtained results indicate that electron qubits based on NV centers and divacancies can be simultaneously located within one silicon carbide matrix, with the subsequent selective initialization, processing (evolution), and reading of the state of a certain single center.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"122 2","pages":"110 - 115"},"PeriodicalIF":1.3,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144990631","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
Frequency Dependence of the Proton Conductivity of Ice and Water 冰和水的质子电导率的频率依赖性
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-09-04 DOI: 10.1134/S0021364025606268
M. I. Ryzhkin, I. A. Ryzhkin, V. V. Sinitsyn, A. V. Klyuev
{"title":"Frequency Dependence of the Proton Conductivity of Ice and Water","authors":"M. I. Ryzhkin,&nbsp;I. A. Ryzhkin,&nbsp;V. V. Sinitsyn,&nbsp;A. V. Klyuev","doi":"10.1134/S0021364025606268","DOIUrl":"10.1134/S0021364025606268","url":null,"abstract":"<p>The frequency dependence of the proton conductivity of ice and water is theoretically investigated in a wide frequency range. The electric field of the inhomogeneous distribution of proton current carriers and their finite mass are taken into account. The first factor is responsible for the difference in the behavior of the transverse and longitudinal conductivities, the appearance of two different characteristic times, and an additional increase in the conductivity at frequencies above the Debye frequency. Physically, the difference in the behavior of the transverse and longitudinal conductivities is due to the collective oscillations of current carriers in the second case. At the same time, the finite masses or inertial properties of current carriers lead to a faster asymptotic decrease in the conductivity as the frequency tends to infinity and to the elimination of the violation of the sum rule characteristic of the conventional Debye frequency dependence. The obtained results are compared to the experiment.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"122 2","pages":"103 - 109"},"PeriodicalIF":1.3,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144990628","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
Proton Transfer in Water 水中质子转移
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-09-04 DOI: 10.1134/S0021364025607730
V. D. Negodin, A. V. Lankin, G. E. Norman
{"title":"Proton Transfer in Water","authors":"V. D. Negodin,&nbsp;A. V. Lankin,&nbsp;G. E. Norman","doi":"10.1134/S0021364025607730","DOIUrl":"10.1134/S0021364025607730","url":null,"abstract":"<p>The effect of proton transfer in water has been studied by the molecular dynamics method with the ReaxFF potential, which supports the dynamic formation of bonds and makes it possible to simulate proton transfer. The self-diffusion coefficients of water and the diffusion coefficients of the H<sub>3</sub>O<sup>+</sup> and OH<sup>–</sup> ions in the water have been studied along the water saturation curve from the triple to the critical point and in a wide pressure range from 1 to 300 MPa. A linear dependence of diffusion coefficients on temperature in Arrhenius coordinates has been obtained, and the transfer energies of molecules and ions have been examined.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"122 2","pages":"85 - 91"},"PeriodicalIF":1.3,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144990620","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
Strain-Induced Local Nucleation of Magnetic Domains in Iron Garnet Film 铁石榴石薄膜中应变诱导的局部磁畴成核
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-09-04 DOI: 10.1134/S0021364025607158
A. A. Karpacheva, N. V. Mitetelo, M. A. Stepanov, A. A. Gus’kov, A. S. Kaminskiy, A. P. Pyatakov
{"title":"Strain-Induced Local Nucleation of Magnetic Domains in Iron Garnet Film","authors":"A. A. Karpacheva,&nbsp;N. V. Mitetelo,&nbsp;M. A. Stepanov,&nbsp;A. A. Gus’kov,&nbsp;A. S. Kaminskiy,&nbsp;A. P. Pyatakov","doi":"10.1134/S0021364025607158","DOIUrl":"10.1134/S0021364025607158","url":null,"abstract":"<p>A new type of flexoelectric effect is discovered as the nucleation of magnetic bubble domains under the action of local pressure on the surface of an iron garnet film. The comparison with a similar electric field-induced effect indicates the analogy between the physical consequences of the action of an electric field and a mechanical stress gradient on a magnetic sample.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"122 2","pages":"97 - 102"},"PeriodicalIF":1.3,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025607158.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144990630","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
Explosive Growth of Large-Scale Magnetic Fluctuations due to Particle Scattering on Developed Small-Scale Weibel Turbulence in a Magnetoactive Plasma 磁活性等离子体中小尺度威贝尔湍流中粒子散射引起的大尺度磁波动的爆炸增长
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-09-04 DOI: 10.1134/S0021364025607146
N. A. Emelyanov, Vl. V. Kocharovsky
{"title":"Explosive Growth of Large-Scale Magnetic Fluctuations due to Particle Scattering on Developed Small-Scale Weibel Turbulence in a Magnetoactive Plasma","authors":"N. A. Emelyanov,&nbsp;Vl. V. Kocharovsky","doi":"10.1134/S0021364025607146","DOIUrl":"10.1134/S0021364025607146","url":null,"abstract":"<p>An analytical theory of nonlinear generation of large-scale magnetic turbulence in an anisotropic magnetoactive plasma in a quasilinear approximation disregarding the direct nonlinear interaction of individual harmonics has been constructed. It has been shown that anomalous particle collisions caused by scattering on small-scale fluctuations of developed Weibel turbulence lead to the instability of long-wavelength harmonics stable in the linear approximation. The nonlinear growth of such harmonics at a given anisotropy of the particle velocity distribution, which is consistent with short-wavelength turbulence at the saturation stage and possible anisotropic injection of particles, occurs in the superexponential regime and corresponds to the explosive instability. The increase law of the large-scale field has been found and the critical explosion time has been determined.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"122 2","pages":"71 - 78"},"PeriodicalIF":1.3,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025607146.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144990621","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
Nonlinear Absorption of 1030-nm Ultrashort Laser Pulses in Polymethyl Methacrylate 1030nm超短激光脉冲在聚甲基丙烯酸甲酯中的非线性吸收
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-08-19 DOI: 10.1134/S0021364025607055
Yu. S. Gulina, J. Zhu, A. V. Gorevoy, N. I. Dolzhenko, P. A. Danilov, E. N. Rimskaya, S. I. Kudryashov
{"title":"Nonlinear Absorption of 1030-nm Ultrashort Laser Pulses in Polymethyl Methacrylate","authors":"Yu. S. Gulina,&nbsp;J. Zhu,&nbsp;A. V. Gorevoy,&nbsp;N. I. Dolzhenko,&nbsp;P. A. Danilov,&nbsp;E. N. Rimskaya,&nbsp;S. I. Kudryashov","doi":"10.1134/S0021364025607055","DOIUrl":"10.1134/S0021364025607055","url":null,"abstract":"<p>The nonlinear interaction of 250-fs laser pulses at a wavelength of 1030 nm with polymethyl methacrylate is investigated using an optimized <i>z</i>-scan technique. It is shown that the mechanism of pulse attenuation for peak intensities below 0.65 TW/cm<sup>2</sup> can be described as four-photon absorption with the coefficient β<sub>4</sub> = (35 ± 5) cm<sup>5</sup>/TW<sup>3</sup>. The nonlinear refractive index <i>n</i><sub>2</sub> = (7.6 ± 0.4) × 10<sup>−4</sup> cm<sup>2</sup>/TW and the critical power for the onset of self-focusing <i>P</i><sub>cr</sub> = (1.42 ± 0.08) MW are determined and these results are used to demonstrate the correspondence between the calculated shift of the nonlinear focal point and the location of the laser-modified regions.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"122 1","pages":"32 - 38"},"PeriodicalIF":1.3,"publicationDate":"2025-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025607055.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144869108","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
Electrostatic Solitary Waves in the Central Plasma Sheet of the Earth’s Magnetotail 地球磁尾中央等离子体片中的静电孤立波
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-08-19 DOI: 10.1134/S0021364025606554
M. V. Leonenko, E. E. Grigorenko, L. M. Zelenyi, H. Fu
{"title":"Electrostatic Solitary Waves in the Central Plasma Sheet of the Earth’s Magnetotail","authors":"M. V. Leonenko,&nbsp;E. E. Grigorenko,&nbsp;L. M. Zelenyi,&nbsp;H. Fu","doi":"10.1134/S0021364025606554","DOIUrl":"10.1134/S0021364025606554","url":null,"abstract":"<p>Using magnetospheric multiscale (MMS) mission observations in the Earth’s magnetotail, it has been shown that numerous secondary sources of electron acceleration are formed in a hot collisionless plasma, which is turbulized by a bursty bulk flow propagating from the primary reconnection region. Such sources may be regions of secondary microreconnections occurring at electron kinetic scales. The observed electrostatic solitons, which serve as markers of “secondary magnetic separatrices,” along which electron beams accelerated to superthermal energies propagate, similar to solitons near primary reconnection separatrices have been studied in this work.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"122 1","pages":"12 - 21"},"PeriodicalIF":1.3,"publicationDate":"2025-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025606554.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144868606","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
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