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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kovaleva E. A., Kuzubov A. A., Avramov P. V., Kholtobina A. S., Kuklin A. V., Tomilin F. N., Sorokin P. B.
Заглавие : A key role of tensile strain and surface termination in formation and properties of La0.7Sr0.3MnO3 composites with carbon nanotubes
Место публикации : Comput. Mater. Sci.: Elsevier, 2017. - Vol. 139. - P.125-131. - ISSN 09270256 (ISSN), DOI 10.1016/j.commatsci.2017.07.021
Примечания : Cited References: 39. - This work was supported by National Research Foundation of Republic of Korea under Grant No. NRF-2017R1A2B4004440 and the government contract of the Ministry of Education and Science of the Russian Federation to Siberian Federal University (Grant No. 16.1455.2017/PCh). The authors would like to thank Joint Supercomputer Center of RAS, Moscow; Center of Equipment for Joint Use of Siberian Federal University, Krasnoyarsk; and Information Technology Centre, Novosibirsk State University for providing the access to their supercomputers. P.B.S gratefully acknowledges the financial supports of the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST «MISiS» (No. К2-2017-001) and RFBR, according to the research project No. 16-32-60138 mol_a_dk. E.A. Kovaleva would also like to acknowledge the program of the President of Russian Federation for Leading Scientific Schools Support (Grant No. 2016 NSh-7559.2016.2).
Ключевые слова (''Своб.индексиров.''): carbon nanotubes--lsmo--interface--spin polarization
Аннотация: Atomic and electronic structure of LSMO-based composites with carbon nanotubes were studied by means of density functional theory with respect to the termination of LSMO surface. The deformation of the tubes caused by the lattice mismatch with the substrate leads to a major change in their electronic structure. The surface terminated with Mn-O layer provides much stronger interaction with carbon nanotubes than Sr-O terminated one does. The interaction with transition metal atoms is essential for spin polarization of the nanotube while no spin injection was observed for Sr-O-supported tubes. © 2017 Elsevier B.V.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Aksenov S. V., Val'kov V. V., Ulanov E. A.
Заглавие : A Fano resonance in transport characteristics of 1D atomic spin structures
Коллективы : Институт теоретической физики им. Л. Д. Ландау РАН, Институт физики твердого тела РАН, "Mesoscopic and Strongly Correlated Electron Systems", conference (6; 2012 ; июнь ; 17-23; Черноголовка, Моск. обл.)
Место публикации : Book of abstracts of Advances Research Workshop "Meso–2012". - 2012. - P.37
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Aksenov S. V.
Заглавие : Spin-dependent nonequilibrium transport in a quadruple quantum-dot device
Коллективы : Российская академия наук, Физико-технический институт им. А.Ф. Иоффе РАН, "Spin Waves", International Symposium
Место публикации : International Symposium "Spin Waves 2018": Program. - 2018. - Sec. 2: Spintronics. - 2-1
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Lukyanenko A. V., Gustaitsev A. O., Smolyakov D. A., Tarasov A. S., Varnakov S. N., Volkov N. V.
Заглавие : Anisotropy of the magnetoimpedance in hybrid hetero structure FeNi/SiO2/p-Si
Коллективы : "Spin physics, spin chemistry, and spin technology", Internnational conference, Физико-технический институт им. А.Ф. Иоффе РАН, Казанский физико-технический институт им. Е. К. Завойского Казанского научного центра РАН, "Инно-мир", центр межрегионального инновационного развития
Место публикации : Int. conf. "Spin physics, spin chem., and spin technol.". - 2015. - P.111
Примечания : This study was supported by the Russian Foundation for Basic Research, projects nos. 14-02-31156 and 14-02-00234, and the Russian Ministry of Education and Science, project no. 02.G25.31.0043
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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) : Gavriliuk A. G., Struzhkin V. V., Lyubutin I. S., Ovchinnikov S. G., Hu M. Y., Chow P.
Заглавие : Another mechanism for the insulator-metal transition observed in Mott insulators
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2008. - Vol. 77, Is. 15. - Ст.155112. - ISSN 1098-0121, DOI 10.1103/PhysRevB.77.155112
Примечания : Cited References: 26
Предметные рубрики: ELECTRONIC-STRUCTURE
SPIN TRANSITION
HIGH-PRESSURES
GDFE3(BO3)(4)
Аннотация: The two widely accepted mechanisms of the insulator-metal Mott-Hubbard transitions which have been considered up until now are driven by the band-filling or bandwidth effects. We found a different mechanism of the Mott-Hubbard insulator-metal transition, which is controlled instead by the changes in the Mott-Hubbard energy U. In contrast to the changes in the bandwidth W in the "bandwidth control" scenario or to the variations of the band-filling n parameter in the "band-filling" scenario, a dramatic decrease in the Mott-Hubbard energy U plays the key role in this mechanism. We have experimentally observed this type of the insulator metal transition in the transition metal oxide BiFeO(3). The decrease in the Mott-Hubbard energy is caused by the high-spin-low-spin crossover in the electronic d shell of 3d transition metal ion Fe(3+) with d(5) configuration under high pressure. The pressure-induced spin crossover in BiFeO(3) was investigated and confirmed by synchrotron x-ray diffraction, nuclear forward scattering, and x-ray emission methods. The insulator-metal transition at the same pressures was found by the optical absorption and dc resistivity measurements.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dudnikov V. A., Velikanov D. A., Kazak N. V., Michel C. R., Bartolome J., Arauzo A., Ovchinnikov S. G., Patrin G. S.
Заглавие : Antiferromagnetic ordering in REM cobaltite GdCoO3
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 54, Is. 1. - P.79-83. - ISSN 1063-7834, DOI 10.1134/S106378341201009X
Примечания : Cited References: 16. - This study was supported by the program of the Branch of Physical Sciences of the Russian Academy of Sciences "Strong Electron Correlations," the Russian Foundation for Basic Research (project no. 09-02-00171-a), and Federal Agency for Science and Innovations (grant no. MK-5632.2010.2).
Предметные рубрики: SPIN-STATE
RCo3O3 R
Sm
Eu
Nd
Аннотация: Temperature and magnetic-field dependences of the static magnetization of polycrystalline cobaltite GdCoO3 have been measured. The magnetic properties of the GdCoO3 sample have been studied in the paramagnetic and antiferromagnetic states. The magnetic phase diagram has been constructed. The exchange field between the Gd-Gd sublattices and the anisotropy field have been estimated.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pankrats A. I., Zharkov S. M., Zeer G. M., Gudim I. A.
Заглавие : Antiferromagnetic resonance and magnetic anisotropy in PrxY1−xFe3(BO3)4 crystals in the region of the magnetic structure transformation “easy axis – easy plane”
Место публикации : J. Alloys Compd. - 2022. - Vol. 909. - Ст.164821. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2022.164821
Примечания : Cited References: 37. - The authors acknowledge the assistance of R. Mironov in some resonance measurements. The SEM and EDS investigations were conducted in the SFU Joint Scientific Center supported by the State assignment (#FSRZ-2020–0011) of the Ministry of Science and Higher Education of the Russian Federation
Аннотация: The spin dynamics, magnetic structures and magnetic anisotropy of single crystals PrxY1−xFe3(BO3)4 have been studied using antiferromagnetic resonance (AFMR) in a wide range of frequencies, magnetic fields, and temperatures. The frequency-field dependences of AFMR for the crystals with x = 0.25 and 0.45 are characteristic of antiferromagnets with the easy plane (EP) anisotropy. The crystals with x = 0.75 and 1.0 exhibit frequency-field dependences that are typical for antiferromagnets with the easy axis (EA) anisotropy. In these crystals, a significant decrease in the effective anisotropy fields of praseodymium upon the transition to the spin-flop state has been found. It is shown that this is the main reason for the large lability intervals, within which the regions of coexistence of the collinear and spin-flop states overlap. In the crystal with x = 0.67, the magnetic field applied along the trigonal axis of the crystal leads to the spin reorientation transition from the EA to the EP state. A magnetic phase diagram of the states on the plane "magnetic field - temperature" is built. In this crystal, the effective anisotropy field of praseodymium also decreases upon the transition to the field-induced EP state. Diamagnetic dilution of the praseodymium subsystem leads to the contribution of this subsystem to the total anisotropy field depending almost linearly on the praseodymium concentration.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Pankrats A., Petrakovskii G. A., Tugarinov V., Temerov V.
Заглавие : Antiferromagnetic resonance and phase diagram of HoFe3(BO3)4
Коллективы : Российская академия наук, Физико-технический институт им. А.Ф. Иоффе РАН, "Spin Waves", International Symposium
Место публикации : International Symposium "Spin waves - 2009": Saint Petersburg, Russia, June 7-12, 2009 : Simposium program. Abstracts. - 2009. - С. 40
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kazak N. V., Belskaya N. A., Moshkina E. M., Bezmaternykh L. N., Vasiliev A. D., Sofronova S. N., Eremina R. M., Eremin E. V., Muftakhutdinov A. R., Cherosov M. A., Ovchinnikov S. G.
Заглавие : Antiferromagnetism of the cation-ordered warwickite system Mn2-xMgxBO4 (x=0.5, 0.6 and 0.7)
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [20-02-00559]; Government of Krasnoyarsk Territory; Krasnoyarsk Regional Fund of Science to the research project [18-42243007]
Место публикации : J. Magn. Magn. Mater. - 2020. - Vol. 507. - Ст.166820. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2020.166820. - ISSN 1873-4766(eISSN)
Примечания : Cited References: 39. - The reported study was funded by the Russian Foundation for Basic Research (no. 20-02-00559), Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project. 18-42243007.
Предметные рубрики: SPIN-GLASS BEHAVIOR
CRYSTAL-STRUCTURES
SINGLE-CRYSTALS
INSIGHTS
MGFEBO4
Аннотация: X-ray diffraction, heat capacity and magnetic measurements are performed on single crystals of Mn2-xMgxBO4 (x = 0.5, 0.6 and 0.7) with the warwickite structure. The monoclinic symmetry is found for all samples with the space group P21/n. The M1 site is occupied by trivalent Mn ions while the M2 site is occupied by a mixture of divalent Mg and Mn ions. Regular cation and charge distributions are observed, which is unusual for heterometallic warwickites. The local octahedral distortions of M1O6 show the monotonic dependence on the Mg content and are in accordance with the Jahn-Teller distortion. All samples are found to undergo long-range antiferromagnetic ordering with rather low transition temperatures of TN = 16, 14 and 13 K for x = 0.5, 0.6, and 0.7, respectively. The ordering of local octahedral distortions, caused by the strong electron-phonon interaction of the trivalent Mn ions, is proposed to stabilise the cationic ordering and, as a result, the long-range magnetic ordering in the material.
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