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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Val'kov V. V., Aksenov S. V., Shustin M. S.
Заглавие : Majorana polarization and caloric anomalies in strongly correlated superconducting nanowires
Коллективы : Российская академия наук, Уральское отделение РАН, Институт физики металлов им. М. Н. Михеева Уральского отделения РАН, Уральский федеральный университет им. первого Президента России Б.Н. Ельцина, Российский фонд фундаментальных исследований, Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : Euro-asian symposium "Trends in magnetism" (EASTMAG-2019): Book of abstracts/ чл. конс. ком.: S. G. Ovchinnikov, N. V. Volkov [et al.] ; чл. прогр. ком. D. M. Dzebisashvili [et al.]. - 2019. - Vol. 2. - Ст.I.P4. - P.142-143. - ISBN 978-5-9500855-7-4 (Шифр В33/E12-125657784)
Примечания : Cited References: 19. - This study was funded by the Russian Foundation for Basic Research (Projects Nos. 19-02-00348, 18-32-00443). M.S.S. is grateful for the support of the Grant of the President of the Russian Federation (project SP-978.2019.5)
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Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Ershov A. E., Bikbaev R. G., Rasskazov I. L., Gerasimov V. S., Timofeev I. V., Polyutov S. P., Karpov S. V.
Заглавие : Collective resonances in hybrid photonic-plasmonic nanostructures
Коллективы : International Conference on Metamaterials and Nanophotonics
Место публикации : J. Phys.: Conf. Ser. - 2020. - Vol. 1461, Is. 1. - Ст.012046. - DOI 10.1088/1742-6596/1461/1/012046
Примечания : Cited References: 11. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science (Grant No. 18-42-240013); A.E. thanks the grant of the President of Russian Federation (agreement 075-15-2019-676)
Аннотация: We present the theoretical model to predict the spectral position of Rayleigh anomalies emerged in hybrid system consisting of periodic array of plasmonic nanodisks embeded into the middle of defect layer of 1D photonic crystal (PhC). The spectral positions of these new emerged Rayleigh anomalies agree well with the results of exact simulations with Finite-Difference Time-Domain (FDTD) method.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pugachev A. M., Zaytseva, I., V, Malinovsky V. K., Surovtsev, N., V, Gorev M. V., Ivleva L. I., Lykov P. A.
Заглавие : Temperature dependence of the spontaneous polarization, acoustic and strain anomalies in strontium barium niobate crystals of different chemical compositions probed by the second harmonic generation technique
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-02-00399, 19-42-543-016, AAAA-A17-117052410033-9]
Место публикации : Ferroelectrics. - 2020. - Vol. 560, Is. 1. - P.54-60. - ISSN 0015-0193, DOI 10.1080/00150193.2020.1722883. - ISSN 1563-5112(eISSN)
Примечания : Cited References: 19. - This work was supported by the Russian Foundation for Basic Research, projects no. 18-02-00399 and 19-42-543-016 and State assignment No AAAA-A17-117052410033-9.
Предметные рубрики: SINGLE-CRYSTALS
RELAXOR
GROWTH
Аннотация: In SrxBa1-xNb2O6 crystals (x = 0.33, 0.5, 0.61, and 0.75), temperature dependences of spontaneous polarization, strain, elastic modules, and second harmonic generation (SHG) signal are compared. It is revealed that SHG describes the temperature dependences of dipole moments in polar nanoregions in paraelectric phase. In the vicinity of the phase transition in paraelectric phase, SHG reflects the temperature behavior of relatively large and long-lived polar asymmetric regions as indicated by the presence of the intermediate temperature range on the temperature dependence of this nonlinear response.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Orlov Yu. S., Dudnikov V. A., Platunov M. S., Gorev M. V., Velikanov D. A., Kazak N. V., Gavrilkin S. Yu., Solov’ev L. A., Veligzhanin A. A., Vereshchagin S. N., Ovchinnikov S. G.
Заглавие : Low-temperature Schottky anomalies and the magnetic state of the p electrons of oxygen in substituted Gd0.4Sr0.6CoO3 – δ cobaltites
Место публикации : J. Exp. Theor. Phys. - 2018. - Vol. 126, Is. 2. - P.217-223. - ISSN 10637761 (ISSN), DOI 10.1134/S1063776118020036
Примечания : Cited References: 29. - This work was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, and Krasnoyarsk Territory Foundation for the Support of Scientific and Research Activity (project nos. 16-42-240413, 16-43-240505); the Council on Grants at the President of the Russian Federation (project nos. SP-1844.2016.1, SP-938.2015.5, NSh-7559.2016.2); and the Russian Foundation for Basic Research (project nos. 17-02-00826, 16-02-00507, 16-32-60049).
Ключевые слова (''Своб.индексиров.''): rare earths--single crystals--specific heat--temperature distribution--x ray absorption
Аннотация: The XANES spectra (X-ray absorption near-edge spectra) at the K edge of Co and the L3 edge of Gd in polycrystalline Gd0.4Sr0.6CoO3 – δ rare-earth oxides with an ordered and disordered distribution of Gd3+ and Sr2+ cations over the A sites in the crystal lattice are measured. The results of XANES measurements do not reveal a noticeable shift in the absorption edge with increasing Sr concentration as compared to the GdCoO3 parent composition. The measured temperature dependences of the heat capacity of polycrystalline ordered and disordered samples and a single-crystal ordered Gd0.4Sr0.6CoO2.85 sample exhibit two Schottky anomalies. These anomalies are thought to be related to the high-spin state of the Co3+ ions in the pyramidal environment caused by oxygen deficiency and to the magnetic state of oxygen p electrons induced by the doping-assisted generation of a hole in the 2p state. The absence of a noticeable shift in the absorption edge and the presence of two Schottky anomalies support the fact that the charge state of cobalt remains unchanged in the compounds under study.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dudnikov V. A., Orlov Yu. S., Kazak N. V., Platunov M. S., Ovchinnikov S. G.
Заглавие : Anomalies of the electronic structure and physical properties of rare-earth cobaltites near spin crossover
Место публикации : JETP Letters. - 2016. - Vol. 104, Is. 8. - P.588-600. - ISSN 00213640 (ISSN), DOI 10.1134/S002136401620011X
Примечания : Cited References: 101. - We are grateful to our colleagues A. Anshits, N. Perov, L. Solov’ev, S. Vereshchagin, S. Gavrilkin, V. Voronov, K. Shaikhutdinov, A. Rogalev, and M.V. Gorev for the fruitful collaboration in the studies of cobaltites for many years. This work was supported by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project nos. NSh-7559.2016.2, SP-1844.2016.1, and SP-938.2015.5), by the Foundation for Support of Innovations (program UMNIK), by the Russian Foundation for Basic Research (project nos. 16-02-00507, 16-02-00098, 16-32-60049-mol-a-dk, and 16-32-00206_mol-a), and jointly by the Russian Foundation for Basic Research and the Krasnoyarsk Territorial Science Foundation (project nos. 16-42-240413, 16-43-240505, and 16-42-240470).
Аннотация: The features of the characteristics of LnCoO3 cobaltites, where Ln is a rare-earth element, are discussed. Both experiment and theory demonstrate that their essentials are related to the low-spin ground state of cobalt ions. The thermally induced occupation of the excited high-spin state gives rise to peaks in the magnetic susceptibility, specific heat, and thermal expansion, as well as to a smooth insulator–metal transition. The analysis is based both on the data from the current literature concerning LaCoO3 and in many aspects on our own studies of GdCoO3 and La1?xGdxCoO3 solid solutions. © 2016, Pleiades Publishing, Inc.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Dubrovskiy A. A., Krasikov A. A., Popkov S. I., Balaev A. D., Shaikhutdinov K. A., Kirillov V. L., Mart'yanov O. N.
Заглавие : Magnetic properties of NiO nano particles: Contributions of the antiferromagnetic and ferromagnetic subsystems in different magnetic field ranges up to 250 kOe
Коллективы : Russian Foundation for Basic Research; Government of the Krasnoyarsk Territory; Krasnoyarsk Territorial Foundation [17-42-240138]
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2017. - Vol. 59, Is. 8. - P.1547-1552. - ISSN 1063-7834, DOI 10.1134/S1063783417080029. - ISSN 1090-6460(eISSN)
Примечания : Cited References:40. - This study was supported by the Russian Foundation for Basic Research, Government of the Krasnoyarsk Territory, and Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activity, project no. 17-42-240138.
Предметные рубрики: EXCHANGE-BIAS
FERRIHYDRITE NANOPARTICLES
HYSTERESIS ANOMALIES
OXIDE
Аннотация: The magnetic properties of antiferromagnetic NiO nanoparticles prepared by thermal decomposition of nickel hydroxocarbonate are investigated. According to the data of magnetization measurements in fields of up to 250 kOe, the magnetic moment linearly grows in strong fields, which is caused by the contribution of the antiferromagnetically ordered nanoparticle core, and the antiferromagnetic susceptibility corresponds to that of bulk polycrystalline NiO. This allowed the antiferromagnetic and ferromagnetic contributions to the total magnetic response of a sample to be quantitatively determined. The latter occurs due to the incomplete spin compensation in an antiferromagnetic nanoparticle caused by defects on its surface. It is demonstrated that to correctly determine the superparamagnetic blocking temperature, it is necessary to take into account the antiferromagnetic susceptibility of the particle core.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Mitskan V. A., Shustin M. S.
Заглавие : Cascade of quantum transitions and magnetocaloric anomalies in an open nanowire
Коллективы : Russian Foundation for Basic Research; Krasnoyarsk Territorial Foundation of RD Activities [16-42-243056r, 16-42-243057, 17-42-240441]; Russian Foundation for Basic Research [16-02-00073]; Government of the Krasnoyarsk Territory
Место публикации : JETP Letters. - 2017. - Vol. 106, Is. 12. - P.798-804. - ISSN 0021-3640, DOI 10.1134/S0021364017240134. - ISSN 1090-6487(eISSN)
Примечания : Cited References:32. - We are grateful to A.D. Fedoseev and A.O. Zlotnikov for the useful comments and discussions of the results. This work was supported jointly by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, and the Krasnoyarsk Territorial Foundation for the Support of R&D Activities (project nos. 16-42-243056r, 16-42-243057, and 17-42-240441), as well as by the Russian Foundation for Basic Research (project no. 16-02-00073).
Предметные рубрики: MAJORANA FERMIONS
ZERO MODES
SUPERCONDUCTOR
Аннотация: A sequence of magnetocaloric anomalies occurring with the change in a magnetic field H is predicted for an open nanowire with the Rashba spin–orbit coupling and the induced superconducting pairing potential. The nature of such anomalies is due to the cascade of quantum transitions related to the successive changes in the fermion parity of the nanowire ground state with the growth of the magnetic field. It is shown that the critical Hc values fall within the parameter range corresponding to the nontrivial values of the Z2 topological invariant of the corresponding 1D band Hamiltonian characteristic of the D symmetry class. It is demonstrated that such features in the behavior of the open nanowire are retained even in the presence of Coulomb interactions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V.
Заглавие : Edge states of an excitonic insulator with the spin-orbit interaction
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-02-00348]
Место публикации : JETP Letters. - 2020. - Vol. 111, Is. 11. - P.647-652. - ISSN 0021-3640, DOI 10.1134/S0021364020110107. - ISSN 1090-6487(eISSN)
Примечания : Cited References: 15. - This work was supported by the Russian Foundation for Basic Research (project no. 19-02-00348)
Предметные рубрики: PHASE
ANOMALIES
Аннотация: The effect of the spin-orbit and Coulomb interactions on the symmetry and topological properties of thes, p, d, ands+dphases of an excitonic insulator has been considered by example of the inverted two-band structure of the HgTe quantum well. It has been found that only thepphase has a nontrivial topology, but it is metastable. It has been shown that the exchange interaction between fermions induces the ground state with thes+dsymmetry of the excitonic order parameter. This phase of the excitonic insulator has zero Chern number; nevertheless, edge states occur in the case of open boundaries.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Gokhfeld Yu. S., Solovyov L. A., Vereshchagin S. N., Borus A. A., Gudim I. A., Kazak N. V.
Заглавие : Thermal expansion and resistivity anomalies in Cu2FeBO5 ludwigite
Коллективы : Российская академия наук, Физико-технический институт им. Е.К. Завойского ФИЦ Казанского научного центра РАН, Казанский (Приволжский) федеральный университет, Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : VIII Euro-Asian symposium "Trends in magnetism" (EASTMAG-2022): Book of abstracts/ program com. S. G. Ovchinnikov [et al.]. - 2022. - Vol. 2, Sect. G: Frustrated and disordered magnetism. - Ст.G.P9. - P.27-28. - ISBN 978-5-94469-051-7
Примечания : Cited References: 5. - Support by RFBR 20-02-00559 and 21-52-12033 ННИО_а is acknowledged
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Zelenov F. V., Semenov S. V., Bayukov O. A.
Заглавие : Anomalies in the magnetic properties of bismuth-substituted diluted yttrium iron garnet
Колич.характеристики :9 с
Место публикации : J. Magn. Magn. Mater. - 2023. - Vol. 582. - Ст.171030. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2023.171030. - ISSN 18734766 (eISSN)
Примечания : Cited References: 61. - The authors are grateful to T. N. Tarasenko for providing samples for magnetic measurements
Аннотация: The magnetic properties and Mossbauer spectra of the Y1.8Bi1.2Fe3.5Ga1.5O12 compound were investigated. A linear temperature dependence of the saturation magnetization, hysteresis, and stability of the coercive field in the magnetically ordered state were found. Using the Mossbauer measurements, the distribution of iron ions over octahedral and tetrahedral sites and the concentration of paramagnetic iron ions were determined. Two critical temperatures – the sublattice magnetization compensation temperature and the ferrimagnet–paramagnet transition temperature – were established. The disappear of the phonon mode in the vicinity of the magnetic transition was observed. The experimental data have been interpreted in terms of the spin–lattice interaction model.
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