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Role of Vacancies in the Yao–Lee Model 空缺职位在姚李模型中的作用
IF 0.8 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,&nbsp;N. B. Perkins","doi":"10.1134/S1063776123100084","DOIUrl":"10.1134/S1063776123100084","url":null,"abstract":"<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":"137 :","pages":"533 - 541"},"PeriodicalIF":0.8,"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
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 0.8 4区 物理与天体物理
Journal of Experimental and Theoretical Physics Pub Date : 2023-12-10 DOI: 10.1134/S1063776123100199
Editorial Board
{"title":"95th Anniversary of the Birthday of Ludmila Prozorova","authors":"Editorial Board","doi":"10.1134/S1063776123100199","DOIUrl":"10.1134/S1063776123100199","url":null,"abstract":"","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"137 :","pages":"421 - 421"},"PeriodicalIF":0.8,"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
Magnetooptical Kerr Spectroscopy of Nanocomposites 纳米复合材料的磁光克尔光谱学
IF 0.8 4区 物理与天体物理
Journal of Experimental and Theoretical Physics Pub Date : 2023-12-10 DOI: 10.1134/S1063776123100151
E. A. Gan’shina, V. V. Garshin, N. N. Perova, I. M. Pripechenkov, A. N. Yurasov, M. M. Yashin, V. V. Rylkov, A. B. Granovskii
{"title":"Magnetooptical Kerr Spectroscopy of Nanocomposites","authors":"E. A. Gan’shina,&nbsp;V. V. Garshin,&nbsp;N. N. Perova,&nbsp;I. M. Pripechenkov,&nbsp;A. N. Yurasov,&nbsp;M. M. Yashin,&nbsp;V. V. Rylkov,&nbsp;A. B. Granovskii","doi":"10.1134/S1063776123100151","DOIUrl":"10.1134/S1063776123100151","url":null,"abstract":"<p>Magnetooptical spectroscopy is an effective method for studying the magnetic microstructure of homogeneous and heterogeneous magnets. This review is devoted to analysis of numerous factors affecting the intensity and spectral dependence of a magnetooptical signal of the equatorial Kerr effect in nanocomposites “ferromagnetic metal–dielectric” in the visible and near infrared spectral regions. Examples of the influence of the metal concentration, nanoparticle size and shape, the substrate, the material of the dielectric, the amorphization of grains, the deposition method, and other factors on the magnetooptical spectrum are considered. The differences in the magnetooptical spectra for the superparamagnetic, superferromagnetic, and ferromagnetic states are demonstrated. It is noted that in the presence of fractions with different field dependences of the magnetization in a nanocomposite, the magnetooptical signal is not proportional to the total magnetization. Examples of enhancement and sign inversion of the magnetooptical signal in nanocomposites are considered. The possibility of the description of magnetooptical spectra using the methods of the effective medium (the Bruggeman method and the Maxwell–Garnett symmetrized approximation) is discussed.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"137 :","pages":"572 - 581"},"PeriodicalIF":0.8,"publicationDate":"2023-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139330983","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 0.8 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,&nbsp;V. I. Marchenko","doi":"10.1134/S1063776123100047","DOIUrl":"10.1134/S1063776123100047","url":null,"abstract":"<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":"137 :","pages":"492 - 493"},"PeriodicalIF":0.8,"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
Low-Dimensional Magnetism in Namibite Cu(BiO)2VO4OH 纳米石 Cu(BiO)2VO4OH 中的低维磁性
IF 0.8 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,&nbsp;T. D. Bushneva,&nbsp;A. G. Ivanova,&nbsp;Z. V. Pchelkina,&nbsp;T. M. Vasil’chikova,&nbsp;O. S. Volokova,&nbsp;A. N. Vasil’ev","doi":"10.1134/S1063776123100114","DOIUrl":"10.1134/S1063776123100114","url":null,"abstract":"<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":"137 :","pages":"520 - 525"},"PeriodicalIF":0.8,"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
Dispersion Relation in Amorphous Ferromagnets 非晶铁磁体中的弥散关系
IF 0.8 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,&nbsp;L. A. Azarova,&nbsp;K. A. Pshenichnyi,&nbsp;O. I. Utesov","doi":"10.1134/S1063776123100059","DOIUrl":"10.1134/S1063776123100059","url":null,"abstract":"<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":"137 :","pages":"463 - 473"},"PeriodicalIF":0.8,"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
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 0.8 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,&nbsp;N. E. Khokhlov,&nbsp;A. M. Kalashnikova","doi":"10.1134/S1063776123100035","DOIUrl":"10.1134/S1063776123100035","url":null,"abstract":"<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":"137 :","pages":"453 - 462"},"PeriodicalIF":0.8,"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
Anisotropy Stabilized Magnetic Phases of the Triangular Antiferromagnet RbFe(MoO4)2 三角形反铁磁体 RbFe(MoO4)2 的各向异性稳定磁相
IF 0.8 4区 物理与天体物理
Journal of Experimental and Theoretical Physics Pub Date : 2023-12-10 DOI: 10.1134/S1063776123100102
Yu. A. Sakhratov, L. E. Svistov, A. P. Reyes
{"title":"Anisotropy Stabilized Magnetic Phases of the Triangular Antiferromagnet RbFe(MoO4)2","authors":"Yu. A. Sakhratov,&nbsp;L. E. Svistov,&nbsp;A. P. Reyes","doi":"10.1134/S1063776123100102","DOIUrl":"10.1134/S1063776123100102","url":null,"abstract":"<p>The magnetic <i>H</i>–<i>T</i> phase diagram of a quasi-two-dimensional easy plane antiferromagnet RbFe(MoO<sub>4</sub>)<sub>2</sub> (<i>S</i> = 5/2) with an equilateral triangular lattice structure is studied with <sup>87</sup>Rb NMR technique for field directed along hard axis <i>C</i><sub>3</sub>. The studies confirm the two step transition from the low field umbrella-like incommensurate magnetic phase to the paramagnetic state observed recently (H. Mitamura et al., J. Magn. Magn. Mater. <b>400</b>, 70 (2016)). The transitions were identified as a lambda anomaly in the spin-lattice relaxation rate and a step increase of magnetic susceptibility at intermediate transition. The <sup>87</sup>Rb NMR study precludes the possibility of either V or fan spin textures in the new high field phase. The additional transition is presumably associated with loss of inter plane magnetic order before the transition to paramagnetic state of individual triangular planes.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"137 :","pages":"526 - 532"},"PeriodicalIF":0.8,"publicationDate":"2023-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139326086","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
Fine Structure of Fe2+ Multiplets, Magnetic Anisotropy, and Interrelation between Magnetic and Electric Structures in Fe2Mo3O8 Fe2Mo3O8 中 Fe2+ 复数的精细结构、磁各向异性以及磁结构与电结构之间的相互关系
IF 0.8 4区 物理与天体物理
Journal of Experimental and Theoretical Physics Pub Date : 2023-12-10 DOI: 10.1134/S106377612310014X
M. V. Eremin, K. V. Vasin, A. R. Nurmukhametov
{"title":"Fine Structure of Fe2+ Multiplets, Magnetic Anisotropy, and Interrelation between Magnetic and Electric Structures in Fe2Mo3O8","authors":"M. V. Eremin,&nbsp;K. V. Vasin,&nbsp;A. R. Nurmukhametov","doi":"10.1134/S106377612310014X","DOIUrl":"10.1134/S106377612310014X","url":null,"abstract":"<p>The effective Hamiltonians of the fine structure of Fe<sup>2+</sup> (<sup>5</sup>D) terms are derived using the methods of operator perturbation theory taking into account covalent bonds between iron and oxygen ions. The energy operators of coupling of magnetic and electric dipole moments with the electric field are obtained for states of multiplets Fe<sup>2+</sup> (<sup>5</sup>E) and Fe<sup>2+</sup> (<sup>5</sup>T<sub>2</sub>) with minimal sets of parameters. The energy spectra of low-lying states, the magnetic anisotropy parameters, and the distribution of quadrupole and induced electric dipole moments over all positions in the unit cell are calculated. The results of calculations are compared with available experimental data.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"137 :","pages":"506 - 519"},"PeriodicalIF":0.8,"publicationDate":"2023-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139325287","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 0.8 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,&nbsp;N. M. Kreines,&nbsp;D. A. Ziganurov,&nbsp;A. V. Sitnikov,&nbsp;S. N. Nikolaev,&nbsp;V. V. Rylkov","doi":"10.1134/S1063776123100023","DOIUrl":"10.1134/S1063776123100023","url":null,"abstract":"<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":"137 :","pages":"562 - 571"},"PeriodicalIF":0.8,"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
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