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95th Anniversary of the Birthday of Ludmila Prozorova 柳德米拉-普罗佐洛娃（Ludmila Prozorova）诞辰 95 周年
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/s1063776123100199
{"title":"95th Anniversary of the Birthday of Ludmila Prozorova","authors":"","doi":"10.1134/s1063776123100199","DOIUrl":"https://doi.org/10.1134/s1063776123100199","url":null,"abstract":"","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"69 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138569344","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 Disorder, Specific Heat, and Magnetic Transitions in Cu2FeBO5 Cu2FeBO5 中的结构紊乱、比热和磁性转变
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/s1063776123100175
Yu. S. Gokhfeld, N. V. Kazak, N. A. Bel’skaya, M. S. Molokeev, I. A. Gudim, O. A. Kondratiev, E. V. Eremin, Yu. V. Knyazev, D. A. Velikanov, S. G. Ovchinnikov
{"title":"Structural Disorder, Specific Heat, and Magnetic Transitions in Cu2FeBO5","authors":"Yu. S. Gokhfeld, N. V. Kazak, N. A. Bel’skaya, M. S. Molokeev, I. A. Gudim, O. A. Kondratiev, E. V. Eremin, Yu. V. Knyazev, D. A. Velikanov, S. G. Ovchinnikov","doi":"10.1134/s1063776123100175","DOIUrl":"https://doi.org/10.1134/s1063776123100175","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Cu<sub>2</sub>FeBO<sub>5</sub> ludwigite single crystals have been grown from a solution–melt by spontaneous crystallization. Using the X-ray diffraction method, the crystal structure has been resolved in detail. Cations in sites M2, M3, and M4 have turned out to be structurally disordered. It has been found that oxygen atoms are disordered in one of five nonequivalent sites (O4). As can be seen from Mössbauer spectroscopy data, Fe<sup>3+</sup> ions occupy four nonequivalent sites with different distortions of coordination octahedra. In the temperature range 40 K ≤ <i>T</i> ≤ 300 K, the spectra represent a superposition of quadrupole doublets. Static susceptibility measurements have revealed two magnetic features at <i>T</i><sub>1</sub> = 35 K and <i>T</i><sub>2</sub> = 20 K and spin-glass effects. Specific heat measurements in the interval 4–300 K have not discovered magnetic-transition-related anomalies.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"27 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138569539","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 Resonance in the Quasi-2D Square Lattice Easy-Plane Antiferromagnet Ba2MnGe2O7 准二维方格易平面反铁磁体 Ba2MnGe2O7 中的磁共振
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/s1063776123100163
V. N. Glazkov, Yu. V. Krasnikova, I. K. Rodygina, M. Hemmida, M. Hirrle, H.-A. Krug von Nidda, T. Masuda
{"title":"Magnetic Resonance in the Quasi-2D Square Lattice Easy-Plane Antiferromagnet Ba2MnGe2O7","authors":"V. N. Glazkov, Yu. V. Krasnikova, I. K. Rodygina, M. Hemmida, M. Hirrle, H.-A. Krug von Nidda, T. Masuda","doi":"10.1134/s1063776123100163","DOIUrl":"https://doi.org/10.1134/s1063776123100163","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>We report results of a multi-frequency (0.8–60 GHz) electron spin resonance study of the spin dynamics in the quasi-2D square lattice antiferromagnet Ba<sub>2</sub>MnGe<sub>2</sub>O<sub>7</sub> both in antiferromagnetically ordered and paramagnetic phases. We directly observe two zero-field gaps in the excitation spectrum of the ordered phase, the larger one being due to easy-plane anisotropy, and the smaller one indicates the presence of fourth-order in-plane anisotropy probably related to the multiferroic properties of this compound. We observe effects of hyperfine interaction on the electron spin resonance spectra in the antiferromagnetically ordered state, which turns out to be comparable with in-plane anisotropy. The hyperfine field strength is found from the observed low-temperature electron spin resonance data. The spin dynamics of the paramagnetic phase is characterized by strong broadening of the ESR absorption line, which can be ascribed to the vortex dynamics of a 2D magnet.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"37 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138569541","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
Role of Vacancies in the Yao–Lee Model 空缺职位在姚李模型中的作用
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/s1063776123100084
V. A. Polyakov, N. B. Perkins
{"title":"Role of Vacancies in the Yao–Lee Model","authors":"V. A. Polyakov, N. B. Perkins","doi":"10.1134/s1063776123100084","DOIUrl":"https://doi.org/10.1134/s1063776123100084","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>We consider the effect of vacancies on the low-energy excitation spectrum of a quantum spin liquid realized in the exactly solvable Yao–Lee model [H. Yao and D.-H. Lee, Phys. Rev. Lett. <b>107</b>, 087205 (2011)]. Physically, vacancies can appear for different reasons (e.g., because of zero magnetic moments on the lattice, or the presence of nonmagnetic impurities, or a random reduction of local bonds of magnetic moments with the remaining lattice). It is shown numerically that the finite density of random vacancies in this model leads to the accumulation of states near zero energy, which can be detected from the change of the behavior of heat capacity at low temperatures. Moreover, it is shown that the low-energy modes are localized more strongly than remaining eigenmodes. This effect is illustrated using the inverse participation ratio (IPR). In the case of time reversal symmetry breaking (e.g., due to the presence of a magnetic field), a gap is opened in the fermion spectrum of the model, and vacancy-induced localized states appear. The energies of these states depend on the structure of the interactions responsible for the time inversion symmetry breaking.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"107 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138569634","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-Flop Transition in Spiral Magnets 螺旋磁体中的自旋-翻转转变
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/s1063776123100047
S. K. Gotovko, V. I. Marchenko
{"title":"Spin-Flop Transition in Spiral Magnets","authors":"S. K. Gotovko, V. I. Marchenko","doi":"10.1134/s1063776123100047","DOIUrl":"https://doi.org/10.1134/s1063776123100047","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>It has been shown that at spin-flop transition in spiral magnets LiCuVO<sub>4</sub>, LiCu<sub>2</sub>O<sub>2</sub>, and CuCrO<sub>2</sub>, Goldstone mode looses its stability.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"7 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138569351","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
Dispersion Relation in Amorphous Ferromagnets 非晶铁磁体中的弥散关系
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/s1063776123100059
S. V. Grigoriev, L. A. Azarova, K. A. Pshenichnyi, O. I. Utesov
{"title":"Dispersion Relation in Amorphous Ferromagnets","authors":"S. V. Grigoriev, L. A. Azarova, K. A. Pshenichnyi, O. I. Utesov","doi":"10.1134/s1063776123100059","DOIUrl":"https://doi.org/10.1134/s1063776123100059","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Dispersion of spin waves in the amorphous ferromagnetic alloy Fe<sub>48</sub>Ni<sub>34</sub>P<sub>18</sub> can be described within the model of a ferromagnet with random anisotropy: <span>(epsilon )</span>(<i>q</i>) = <i>Aq</i><sup>2</sup> + <i>g</i>μ<sub>B</sub><i>H</i> + δω(<i>q</i>), where δω(<i>q</i>) is an additional term linear in |<i>q</i>|. The method of small-angle scattering of polarized neutrons is used to prove the importance of the additional term δω(<i>q</i>) in dispersion. The measurements are carried out for different values of the external magnetic field <i>H</i> and neutron wavelength λ. The scattering map of neutrons represents a circle centered at the point <i>q</i> = 0. The stiffness <i>A</i> of spin waves is derived directly from the λ-dependence of the radius of this circle. The spin-wave stiffness <i>A</i> of the amorphous alloy weakly decreases from 140 to 110 meV Å<sup>2</sup> as temperature increases from 50 to 300 K. The field dependence of the radius demonstrates the presence of an additional term δω(<i>q</i>) in the form of an energy gap that is almost independent of field and temperature. The value of the additional term is Δ = 0.015 ± 0.002 meV.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"53 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138569475","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
Low-Dimensional Magnetism in Namibite Cu(BiO)2VO4OH 纳米石 Cu(BiO)2VO4OH 中的低维磁性
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/s1063776123100114
L. V. Shvanskaya, T. D. Bushneva, A. G. Ivanova, Z. V. Pchelkina, T. M. Vasil’chikova, O. S. Volokova, A. N. Vasil’ev
{"title":"Low-Dimensional Magnetism in Namibite Cu(BiO)2VO4OH","authors":"L. V. Shvanskaya, T. D. Bushneva, A. G. Ivanova, Z. V. Pchelkina, T. M. Vasil’chikova, O. S. Volokova, A. N. Vasil’ev","doi":"10.1134/s1063776123100114","DOIUrl":"https://doi.org/10.1134/s1063776123100114","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A synthetic analog of rare secondary mineral namibite Cu(BiO)<sub>2</sub>VO<sub>4</sub>OH has been obtained by the hydrothermal method. The crystal structure of this compound contains isolated uniform chains of vertex-connected copper–oxygen octahedra. Magnetic susceptibility (χ) and magnetization (<i>M</i>) measurements have not indicated the long-range order in the temperature interval 2–300 K. Specific heat (<i>C</i><sub><i>p</i></sub>) measurements suggest the formation of a spin-liquid state at low temperatures. X-band electron paramagnetic resonance data recorded at low temperatures have demonstrated only a signal from impurities. First-principles calculations have estimated the exchange interaction in the chains as <i>J</i> = 555 K, whereas exchange interactions between the chains turn out to be one to two orders of magnitude smaller. Thus, namibite represents a rare example of an unordered half-integer spin chain.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"88 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138569538","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
Propagation of a Laser-Induced Magnetostatic Wave Packet in a Pseudo Spin Valve in the Presence of Spin Pumping 存在自旋泵浦时激光诱导的磁静电波包在伪自旋阀中的传播
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/s1063776123100035
A. E. Fedianin, N. E. Khokhlov, A. M. Kalashnikova
{"title":"Propagation of a Laser-Induced Magnetostatic Wave Packet in a Pseudo Spin Valve in the Presence of Spin Pumping","authors":"A. E. Fedianin, N. E. Khokhlov, A. M. Kalashnikova","doi":"10.1134/s1063776123100035","DOIUrl":"https://doi.org/10.1134/s1063776123100035","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Spin pumping and angular momentum transfer, i.e., the emission of a spin current by a precessing magnetization and the reverse process of absorption, play an important role in coherent magnetic dynamics processes in multilayered structures. For ferromagnetic layers separated by a nonmagnetic interlayer these effects give rise to a dynamic coupling between the layers that is dissipative in nature and affects the damping of coherent magnetization precession. We have used micromagnetic simulations to analyze the influence of such a dynamic coupling on the propagation of a laser-induced surface magnetostatic wave (MSW) packet in a pseudo spin valve structure consisting of two ferromagnetic metallic layers separated by a nonmagnetic metallic interlayer. We have considered the MSW generation due to laser-induced heating, which leads to dynamic changes in magnetization and magnetic anisotropy, and added the dynamic coupling effect to the equations for our micromagnetic simulations. As a result, we have revealed that under certain conditions such a coupling leads to a decrease in the spatial damping of the wave packet that corresponds to the acoustic MSW mode forming in the structure considered.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"4 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138564062","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
Specific Features of g ≈ 4.3 EPR Line Behavior in Magnetic Nanogranular Composites 磁性纳米粒状复合材料中 g ≈ 4.3 EPR 线行为的具体特征
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/s1063776123100023
A. B. Drovosekov, N. M. Kreines, D. A. Ziganurov, A. V. Sitnikov, S. N. Nikolaev, V. V. Rylkov
{"title":"Specific Features of g ≈ 4.3 EPR Line Behavior in Magnetic Nanogranular Composites","authors":"A. B. Drovosekov, N. M. Kreines, D. A. Ziganurov, A. V. Sitnikov, S. N. Nikolaev, V. V. Rylkov","doi":"10.1134/s1063776123100023","DOIUrl":"https://doi.org/10.1134/s1063776123100023","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Films of metal-insulator nanogranular composites M<sub><i>x</i></sub>D<sub>100 –</sub> <sub><i>x</i></sub> with different composition and percentage of metal and dielectric phases (M = Fe, Co, CoFeB; D = Al<sub>2</sub>O<sub>3</sub>, SiO<sub>2</sub>, LiNbO<sub>3</sub>; <i>x</i> ≈ 15–70 at %) are investigated by magnetic resonance in a wide range of frequencies (<i>f</i> = 7–37 GHz) and temperatures (<i>T</i> = 4.2–360 K). In addition to the usual ferromagnetic resonance signal from an array of nanogranules, the experimental spectra contain an additional absorption peak, which we associate with the electron paramagnetic resonance (EPR) of Fe and Co ions dispersed in the insulating space between the granules. In contrast to the traditional EPR of Fe and Co ions in weakly doped non-magnetic matrices, the observed peak demonstrates a number of unusual properties, which we explain by the presence of magnetic interactions between ions and granules.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"14 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138569728","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
Influence of Impurities on Adhesion at the TiAl/Al2O3 Interface 杂质对TiAl/Al2O3界面附着力的影响
IF 1.1 4区 物理与天体物理
Journal of Experimental and Theoretical Physics Pub Date : 2023-10-26 DOI: 10.1134/S1063776123090030
A. V. Bakulin, A. S. Kulkov, S. E. Kulkova
{"title":"Influence of Impurities on Adhesion at the TiAl/Al2O3 Interface","authors":"A. V. Bakulin,&nbsp;A. S. Kulkov,&nbsp;S. E. Kulkova","doi":"10.1134/S1063776123090030","DOIUrl":"10.1134/S1063776123090030","url":null,"abstract":"<p>The influence of substitutional impurities on adhesion at the TiAl/Al<sub>2</sub>O<sub>3</sub> interface with an oxygen termination has been studied by the projector augmented-wave method within the density functional theory. It has been shown that transition metals and a number of <i>s</i>,<i>p</i>-elements substituting for the interfacial titanium atom reduce adhesion, whereas Group VB and VIB elements enhance chemical bonding at the interface. The local densities of states, charge density distribution, overlap populations for interfacial atom bonding, and other electronic characteristics have been calculated that make it possible to reveal key factors influencing adhesion at the alloy–oxide interface. A correlation has been found between the influence of impurities on bonding energy at the inner and outer interfaces. A comparison of obtained data with those for the interface with Ti-enriched Ti<sub>3</sub>Al alloy shows that the interface loses strength with decreasing Ti content in the alloy.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"137 3","pages":"362 - 371"},"PeriodicalIF":1.1,"publicationDate":"2023-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71910747","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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