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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Гохфельд, Денис Михайлович, Шаломов С. Ю., Сультимов Д. Б., Петров, Михаил Иванович
Заглавие : Самопроизвольное вращение магнитов, левитирующих над высокотемпературным сверхпроводником
Колич.характеристики :7 с
Место публикации : Сверхпроводимость: фунд. и приклад. исслед. - 2024. - № 1. - С. 34-40. - ISSN 29495644 (ISSN), DOI 10.62539/2949-5644-2024-0-1-34-40; Supercond. Fund. Appl. Res. - ISSN 29495660 (eISSN0
Примечания : Библиогр.: 11. - Авторы выражают благодарность А.Л. Фрейдману за создание сверхпроводящей платформы, С.В. Семенову за помощь с температурными измерениями, а также С.В. Комогорцеву за полезные обсуждения
Аннотация: Левитация постоянного магнита цилиндрической формы над высокотемпературным сверхпроводником, охлаждаемым жидким азотом, сопровождается спонтанными колебаниями, переходящими во вращение. Причиной вращения является неоднородность намагниченности магнита, вызванная градиентом температур вдоль вертикальной оси. Проведен эксперимент по левитации магнитов Nd–Fe–B над композитным высокотемпературным сверхпроводником. Результаты эксперимента подтверждают, что частота вращения зависит от намагниченности верхней и нижней половин магнита. Предложены способы контроля частоты вращения левитирующего магнита.Levitation of a cylindrical permanent magnet over a high-temperature superconductor cooled by liquid nitrogen can be accompanied by spontaneous oscillations and rotation. The reason for spontaneous rotation of the magnet is magnetization inhomogeneity induced by the temperature gradient. An experiment was carried out on the levitation of Nd–Fe–B magnets over a composite high-temperature superconductor. The experimental results confirm that the rotation frequency depends on the difference in the magnetization values in its upper and lower halves of the magnet. Methods for controlling the rotation frequency of a levitating magnet are proposed.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zobov V. E., Lundin A. A.
Заглавие : Quantum and classical correlations in the solid-state NMR free induction decay
Место публикации : International Conference Magnetic Resonance: Fundamental Research and Pioneering Applications: Book of abstracts. - 2014. - Ст.P 77. - P.160
Примечания : Cited References: 16
Аннотация: The free induction decay (FID) of the transverse magnetization in a dipolar-coupled rigid lattice is a fundamental problem in magnetic resonance and in the theory of many-body systems. As it was shown earlier the FID shapes for the systems of classical magnetic moments and for quantum nuclear spin ones coincide if there are many nearly equivalent nearest neighbors n in a solid lattice. In this paper, we reduce a multispin density matrix of above system to a two-spin matrix. Then we obtain analytic expressions for the mutual information and the quantum and classical parts of correlations at the arbitrary spin quantum number S, in the high-temperature approximation. The time dependence of these functions is expressed via the derivative of the FID shape. To extract classical correlations for S 1/2 we provide generalized POVM measurement (positive-operator-valued measure) using the basis of spin coherent states. We show that in every pair of spins the portion of quantum correlations changes from 1/2 to 1/(S + 1) when S is growing up, and quantum properties disappear completely only if S → ∞.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vetrov S.Ya., Pyatnov M. V., Timofeev I. V.
Заглавие : Photonic defect modes in a cholesteric liquid crystal with a resonant nanocomposite layer and a twist defect
Коллективы : SB RAS [43, 101, 24.29]; Russian Fund of Fundamental Research Grant [14-02-31248]; Russian Ministry of Education and Science under the Government program [3.1276.2014/K]; Russian Federation [MK-250.2013.2]; NSCT-SB RAS joint project
Место публикации : Phys. Rev. E: American Physical Society, 2014. - Vol. 90, Is. 3. - Ст.32505. - ISSN 1539-3755, DOI 10.1103/PhysRevE.90.032505. - ISSN 1550-2376
Примечания : Cited References: 36. - This work was partially supported by Grants No. 43, No. 101, and No. 24.29 of SB RAS; Russian Fund of Fundamental Research Grant No. 14-02-31248; Russian Ministry of Education and Science under the Government program, Project No. 3.1276.2014/K; Grant of the President of the Russian Federation Grant No. MK-250.2013.2, and the NSCT-SB RAS joint project.
Предметные рубрики: OPTICAL-PROPERTIES
GENERATION
MEDIA
FILMS
Аннотация: We have studied spectral properties of a cholesteric liquid crystal with a combined defect consisting of a nanocomposite layer and a twist. The nanocomposite layer is made of metallic nanoballs dispersed in a transparent matrix and featuring effective resonant permittivity. A solution has been found for the transmission spectrum of circularly polarized waves in the structure. We have analyzed spectral splitting of the defect mode in the band gap of the cholesteric when its frequency coincides with the nanocomposite resonant frequency. Defect modes have characteristics strongly dependent on the magnitude and the sign of the phase difference of the cholesteric helix on both sides of the defect layer. It has been found that the band gap width and the position and localization degree of defect modes can be effectively controlled by external fields applied to the cholesteric.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Aksenov S. V.
Заглавие : Renormalization of triplet populations of a spin dimer in zero magnetic field with quantum transport
Коллективы : Ural International Winter School on the Physics of Semiconductors , Program for Fundamental Research of the Presidium of the Russian Academy of Sciences [32]; Russian Fund for Basic Research [16-02-00073, 18-32-00443]; Government of Krasnoyarsk Krai; Krasnoyarsk Regional Fund for Science [17-42-240441, 18-42-243017]; Russian Federation [MK-3722.2018.2]
Место публикации : Low Temp. Phys. - 2019. - Vol. 45, Is. 2: 22nd Ural International Winter School on the Physics of Semiconductors (Feb 20-23, 2018, Alapayevsk, RUSSIA). - P.165-175. - ISSN 1063-777X, DOI 10.1063/1.5086406. - ISSN 1090-6517(eISSN)
Примечания : Cited References: 20. - This work was performed with the support of the Program for Fundamental Research of the Presidium of the Russian Academy of Sciences, No. 32, "Nanostructures: physics, chemistry, biology, foundations of technology", the Russian Fund for Basic Research (grants #16-02-00073, #18-32-00443), the Government of Krasnoyarsk Krai, the Krasnoyarsk Regional Fund for Science within the scientific projects: "Connected Majorana fermions in nanomaterials with strong electron correlations and quantum transport of electrons in systems based on them" (No. 17-42-240441) and "Manifestation of Coulomb interactions and the effects of limited geometry in properties of topological regional states of nanostructures from spin-orbital interaction" (No. 18-42-243017). S.A. expresses his gratitude for a grant of the President of the Russian Federation MK-3722.2018.2.
Предметные рубрики: SINGLE-MOLECULE
Аннотация: Based on the nonequilibrium Keldysh technique in the atomic representation, the effect of inducing a varied population of magnetic states of a spin dimer interacting with electrons transported through a system in a zero magnetic field was studied. In order to find the filling numbers of the quantum states of the system under the strong nonequilibrium condition, a system of kinetic equations was derived and solved by the method of nonequilibrium diagram technique for Hubbard operators. Numerical analysis of these equations made it possible to reveal nonequilibrium renormalizations when accounting for strong spin-fermion correlations.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Kagan, M. Yu, Aksenov S. V.
Заглавие : Fano effect in Aharonov-Bohm ring with topologically superconducting bridge
Коллективы : RAS Presidium program for fundamental research [32]; Russian Foundation for Basic Research [16-02-00073, 17-02-00135, 18-32-00443]; Government of Krasnoyarsk Territory; Krasnoyarsk Regional Fund of Science [17-42-240441, 18-42-243017]; Russian Federation [MK-3722.2018.2]; Program of Basic Research of the National Research University Higher School of Economics
Место публикации : J. Phys.: Condens. Matter. - 2019. - Vol. 31, Is. 22. - Ст.225301. - ISSN 0953-8984, DOI 10.1088/1361-648X/ab0b8c. - ISSN 1361-648X(eISSN)
Примечания : Cited References: 69. - The reported study was funded by the RAS Presidium program for fundamental research No. 32 'Nanostructures: physics, chemistry, biology and technology fundamentals', Russian Foundation for Basic Research (projects Nos. 16-02-00073, 17-02-00135, 18-32-00443), Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research projects: 'Majorana bound fermions in the nanomaterials with strong electron correlations and quantum electron transport in the devices containing these materials' (No. 17-42-240441), 'The manifestation of Coulomb interactions and effects of bounded geometry in the properties of topological edge states of nanostructures with spin-orbit interaction' (No. 18-42-243017). SA is grateful to the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools, project No. MK-3722.2018.2. MYK thanks the Program of Basic Research of the National Research University Higher School of Economics for support.
Ключевые слова (''Своб.индексиров.''): topological superconductivity--majorana bound state--andreev bound state--aharonov-bohm ring
Аннотация: Taking into account an inner structure of the arms of the Aharonov-Bohm ring (AB ring) we have analyzed the transport features related to the topological phase transition which is induced in a superconducting wire (SC wire) with strong spin-orbit interaction (SOI). The SC wire acts as a bridge connecting the arms. The in-plane magnetic-field dependence of linear-response conductance obtained using the nonequilibrium Green's functions in the tight-binding approximation revealed the Breit-Wigner and Fano resonances (FRs) if the wire is in the nontrivial phase. The effect is explained by the presence of two interacting transport channels in the system. As a result, the FRs are attributed to bound states in continuum (BSCs). The BSC lifetime is determined by both hopping parameters between subsystems and the SC-wire properties. It is established that the FR width and position are extremely sensitive to the type of the lowest-energy excitation in the SC wire, the Majorana or Andreev bound state (MBS or ABS, respectively). Moreover, it is shown that in the specific case of the AB ring, the T-shape geometry, the FR disappears for the transport via the MBS and the conductance is equal to one quantum. It doubles in the local transport regime. On the contrary, in the ABS case the local conductance vanishes. The influence of the mean-field Coulomb interactions and diagonal disorder in the SC wire on the FR is investigated.
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Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Kuzovnikova, Ludmila, Komogortsev S. V., Denisova E. A., Iskhakov R. S., Nemtsev I. V., Volochaev M. N., Shepeta, Natalia
Заглавие : Structure and magnetism in ball-milled core-shell Al2O3@Co particles
Коллективы : International Conference on Fundamental Bases of Mechanochemical , Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [18-42-240006]
Место публикации : Mater. Today: Proc. - 2019. - Vol. 12: 5th International Conference on Fundamental Bases of Mechanochemical (JUN 25-28, 2018, Russian Acad Sci, Siberian Branch, Inst Solid State Chem & Mechanochemistry, Novosibirsk, Russia), Pt. 1. - P.159-162. - , DOI 10.1016/j.matpr.2019.03.087
Примечания : Cited References: 19. - This work was supported by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project No 18-42-240006.
Аннотация: The core-shell Al2O3@Co particles were prepared by the ball-milling of the composite Al2O3-Co particles synthesized by electroless reduction. During the ball-milling process, both, the core-shell particle size and the ratio of hcp/fcc phases changed. To perform a phase analysis of the cobalt shell we used an approach based on the magnetic measurements. The use of Al2O3-Co composite particles as the precursors for the ball milling significantly shortens the time needed for a change in the phase composition of cobalt.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Iskhakov R.S., Kuzovnikova L.A., Denisova E.A., Komogortsev S.V., Bondarenko G.V.
Заглавие : Structure and magnetic features of Co-Cu alloys synthesized by mechanical alloying from the powder precursors with excess enthalpy
Коллективы : Fundamental Bases of Mechanochemical Technologies, International Conference
Место публикации : III International conference "Fundamental Bases of Mechanochemical Technologies". FBMT-2009. - 2009. - P.135
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Dzebisashvili D. M., Korovushkin M. M., Komarov K. K., Barabanov A. F.
Заглавие : Strong Spin-Charge Coupling and Its Manifestation in the Quasiparticle Structure, Cooper Instability, and Electromagnetic Properties of Cuprates
Коллективы : "Fundamental problems in high-temperature superconductivity" of the Presidium of the Russian Academy of Sciences, Russian Foundation for Basic Research [12, 18-02-00837]; Krasnoyarsk Krai Foundation for Supporting the Scientific and Technical Activity [18-42-243002, 18-42-243018, 18-42-240014]; President of the Russian Federation [MK-37.2019.2, MK-3722.2018.2]; Russian Foundation for Basic Research [19-02-00509]
Место публикации : J. Exp. Theor. Phys. - 2019. - Vol. 128, Is. 6. - P.885-898. - ISSN 1063-7761, DOI 10.1134/S1063776119050078. - ISSN 1090-6509(eISSN)
Примечания : Cited References: 83. - This study was supported by the program no. 12 "Fundamental problems in high-temperature superconductivity" of the Presidium of the Russian Academy of Sciences, Russian Foundation for Basic Research (project no. 18-02-00837), the administration of the Krasnoyarsk Krai, Krasnoyarsk Krai Foundation for Supporting the Scientific and Technical Activity under project nos. 18-42-243002 (Manifestations of spin-nematic correlations in spectral characteristics of the electronic structure and their influence on the properties of cuprate superconductors in applications), 18-42-243018 (Contact phenomena and magnetic disorder in the problem of formation and detection of topologically protected edge states in semiconducting nanostructures), and 18-42-240014 (Single-orbital effective model of an ensemble of spin-polaron quasiparticles in the problem of description of the intermediate state and pseudogap behavior of cuprate superconductors), as well as the Council for grants from the President of the Russian Federation (project nos. MK-37.2019.2 and MK-3722.2018.2). The work of A.F.B was supported by the Russian Foundation for Basic Research (project no. 19-02-00509).
Предметные рубрики: HIGH-TEMPERATURE SUPERCONDUCTIVITY
INTERSITE COULOMB REPULSION
Аннотация: The Fermi excitation spectrum, the problem of Cooper instability, and the Londons magnetic field penetration depth in cuprate superconductors are considered using the unified conception based on accounting for the strong coupling between the spin of copper ions and holes at oxygen ions. This coupling leads to strong renormalization of the primary spectrum of oxygen holes with the formation of spin-polaron quasiparticles. Analysis of Cooper instability performed using the spin-polaron concept for different channels has shown that only the superconducting d-wave pairing occurs in the ensemble of spin-polaron quasiparticles, and there are no solutions corresponding to the s-wave pairing. It has been demonstrated that the superconducting d-wave pairing is not suppressed by the Coulomb repulsion of holes located at neighboring oxygen ions. This effect is due to peculiarities in the crystallographic structure of the CuO2 plane and the aforementioned strong spin-fermion coupling. As a result, such interaction of holes is omitted in the kernel of the integral equation for the superconducting order parameter with the d-wave symmetry. It has been shown the Hubbard repulsion of holes and their interaction for the second coordination sphere of the oxygen sublattice for actual intensities of the interaction do not suppress the d-wave type of superconductivity. For the spin-polaron ensemble, we have analyzed the dependence of the Londons magnetic field penetration depth on the temperature and hole concentration. It has been established that the peculiarities of this dependence are closely related to specific features of the spin-polaron spectrum.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tarasov A. S., Lukyanenko A. V., Rautskii M. V., Bondarev I. A., Smolyakov D. A., Tarasov I. A., Yakovlev I. A., Varnakov S. N., Ovchinnikov S. G., Baron F. A., Volkov N. V.
Заглавие : Spin-dependent electrical hole extraction from low doped p-Si via the interface states in a Fe3Si/p-Si structure
Коллективы : Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [18-42-243022]; Russian Foundation for Basic Research [18-32-00035]; Ministry of Education and Science of the Russian Federation; Siberian Branch of the Russian Academy of Sciences [II.8.70]; Fundamental research program of the Presidium of the RAS [32]
Место публикации : Semicond. Sci. Technol. - 2019. - Vol. 34, Is. 3. - Ст.035024. - ISSN 0268-1242, DOI 10.1088/1361-6641/ab0327. - ISSN 1361-6641(eISSN)
Примечания : Cited References: 56. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund by project. 18-42-243022 and supported in part by the Russian Foundation for Basic Research by project no. 18-32-00035. The work was partially supported by the Ministry of Education and Science of the Russian Federation and by Siberian Branch of the Russian Academy of Sciences (Project II.8.70) and Fundamental research program of the Presidium of the RAS no. 32 "Nanostructures: physics, chemistry, biology, basics of technologies"
Предметные рубрики: ALLOYS
Ключевые слова (''Своб.индексиров.''): spin accumulation--interface states--hybrid structures--hanle effect--iron silicide
Аннотация: Spin accumulation effect in Fe3Si/p-Si structure with low boron doped silicon substrate was found. Calculated spin lifetimes are comparable with results reported earlier but for structures with highly doped semiconductors (SC) with or without a tunnel barrier introduced between the SC and ferromagnet (FM). Electrical characterization of a prepared Fe3Si/p-Si diode allowed the determination of possible reasons for the pronounced spin signal. Analysis of the forward bias I-V curve revealed a Schottky barrier at the Fe3Si/p-Si interface with a height of φBp = 0.57 eV. Then, using impedance spectroscopy, we observed interface states localized in the band gap of silicon with energy of E LS = 40 meV. Such states most probably cause the observed spin signal. We believe that in our experiment, spin-dependent hole extraction was performed via the interface states resulting in the minority spin accumulation in the silicon valence band. The observed effect paves the way to the development of different spintronic devices based on FM/SC structures without dielectric tunneling barriers.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Loiko V. A., Konkolovich A. V., Miskevich A. A., Krakhalev M. N., Prishchepa O. O., Zyryanov V. Ya.
Заглавие : Small-angle scattering and radiation polarization by a stretched polymer film with nematic liquid crystal droplets having a single-domain structure
Коллективы : Belarusian Republican Foundation for Fundamental Research [F18RA-003]; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of Krasnoyarsk krai; Krasnoyarsk Krai Foundation of Science [18-42-243006]
Место публикации : Opt. Spectrosc. - 2020. - Vol. 128, Is. 3. - P.331-338. - ISSN 0030-400X, DOI 10.1134/S0030400X20030121. - ISSN 1562-6911(eISSN)
Примечания : Cited References: 24. - This work was carried out within the framework of the agreement on interacademic collaboration between the National Academy of Sciences of Belarus and Siberian Branch of the Russian Academy of Sciences. It was supported by the Belarusian Republican Foundation for Fundamental Research (project no. F18RA-003). M.N. Krakhalev acknowledges the support of the Russian Foundation for Basic Research, the Government of Krasnoyarsk krai, and Krasnoyarsk Krai Foundation of Science (grant no. 18-42-243006).
Предметные рубрики: IONIC MODIFICATION
LIGHT
Аннотация: The coefficient of directed transmittance of a stretched polymer-dispersed liquid crystal film with a defect-free single-domain liquid crystal droplet structure formed by a stretched surfactant-doped film and the polarization degree of forward-transmitted light in the visible and near-infrared spectrum ranges are studied. Results are presented for the 5CB, E7, and E44 nematic liquid crystals. Dependences of the transmission coefficient and polarizing ability of the film on the photodetector field of view are studied. Relationships allowing one to determine film parameters at which the transmission coefficient and polarizing ability of the films simultaneously reach values close to limit ones (0.5 and ±1.0, respectively) are obtained in the Foldy–Twersky and anomalous diffraction approximations.
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