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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ding Y., Haskel D., Ovchinnikov S.G., Tseng Y.-Ch., Orlov Yu.S., Mao N-K.
Заглавие : A Novel Magnetic Transition in Magnetite Fe3O4 between 12-16 GPa
Место публикации : Phys. Rev. Lett. - 2008. - Vol. 100. - С. 045508
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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 сборника (однотомник)
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Orlov Yu. S., Dudnikov V. A., Kazak N. V., Shaikhutdinov K. A.
Заглавие : Anomalous structural, magnetic, optical and electronic properties of GdCoO3-y
Коллективы : International Conference on Magnetism
Место публикации : 20th Int. Сonf. on Magnetism (ICM-2015): book of abstracts. - 2015. - Ст.TH.C
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Orlov Yu. S., Dudnikov V. A., Vereschagin S. N., Perov N. S.
Заглавие : Concentration dependence of the spin gap in solid solutions La1−xGdxCoO3−δ
Коллективы : Moscow International Symposium on Magnetism , Siberian Branch of Russian Academy of Sciences [38]
Место публикации : J. Magn. Magn. Mater.: Elsevier Science, 2015. - Vol. 383. - P.162-165. - ISSN 0304, DOI 10.1016/j.jmmm.2014.11.083
Примечания : Cited References:20. - This work is supported by Siberian Branch of Russian Academy of Sciences (Projects no. 38), RFBR Grants nos. 13-02-00358, 13-02-00958, 13-02-01395, 14-02-31051, and 14-02-00186, and President of Russia Grant no. NSh-2886.2014.2.
Предметные рубрики: STATE TRANSITION
TEMPERATURE
LACOO3
GDCOO3
COBALTITES
Ключевые слова (''Своб.индексиров.''): strong correlated electron systems--spin crossover systems--magnetic--properties--solid solutions
Аннотация: The temperature dependence of the static magnetization of polycrystalline rare-earth cobaltites La1−xGdxCoO3−δ (x=0.2, 0.5, 1) was measured in a wide temperature range up to 900 K. The contribution from Co3+ ions at high temperatures to the magnetic susceptibility was obtained. The Birch–Murnaghan equation and the magnetic date were used to determine the spin gap Δ S as the difference between the energies of high-spin and low-spin states in these compounds.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dudnikov V. A., Ovchinnikov S. G., Orlov Yu.S., Kazak N. V., Michel C. R., Patrin G. S., Yurkin G.Yu.
Заглавие : Contribution of Co3+ ions to the high-temperature magnetic and electrical properties of GdCoO3
Место публикации : J. Exp. Theor. Phys.: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 114, Is. 5. - P.841-849. - ISSN 1063-7761, DOI 10.1134/S106377611203003X
Примечания : Cited References: 28. - This work was supported by the Ural Branch of the Russian Academy of Sciences and Siberian Branch of the Russian Academy of Sciences (project no. 40), the Russian Foundation for Basic Research (project nos. 09-02-00171-a, 10-02-00251), program 2.3 of the Department of Physical Sciences of Russian Academy of Sciences, and Nonprofit Dinastiya Foundation.
Предметные рубрики: SPIN-STATE
RCOO3 R
TRANSITIONS
COBALTITES
LACOO3
OXIDES
SM
EU
ND
Аннотация: The temperature dependence of the static magnetization of polycrystalline rare-earth cobaltite GdCoO3 is measured in the temperature range 2-800 K. The magnetic behaviors of GdCoO3 and Gd3+ are found to be different at temperatures above room temperature, which is caused by the appearance of a contribution from Co3+ ions at high temperatures. The temperature dependence of the magnetic susceptibility of GdCoO3 is determined by the magnetization of rare-earth gadolinium ions and the additional paramagnetic contribution induced by the thermally excited magnetic terms of Co3+ ions. The LDA + GTB method is used to calculate the electronic structure of GdCoO3 in the temperature range 0-300 K with allowance for strong electron correlations. The energy spectrum of GdCoO3 is found to have intragap states that decrease the dielectric gap width with increasing temperature.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Orlov Yu. S., Sokolov A. Е., Dudnikov V. A., Shulga K. V., Volochaev M. N., Zharkov S. M., Shestakov N. P., Vysotin M. A., Ovchinnikov S. G.
Заглавие : Contribution of the multiplicity fluctuation in the temperature dependence of phonon spectra of rare-earth cobaltites
Место публикации : Molecules. - 2020. - Vol. 25, Is. 18. - Ст.4316. - ISSN 14203049 (ISSN), DOI 10.3390/molecules25184316
Примечания : Cited References: 34. - This work was supported by the Russian Science Foundation grant 18-02-00022. The scanning electron microscopy 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. The other research was carried out at the Krasnoyarsk Regional Center of Research Equipment of the Federal Research Center “Krasnoyarsk Science Center SB RAS”
Аннотация: We have studied, both experimentally and theoretically, the unusual temperature dependence of the phonon spectra in NdCoO3, SmCoO3 and GdCoO3, where the Co3+ ion is in the low-spin (LS) ground state, and at the finite temperature, the high-spin (HS) term has a nonzero concentration nHS due to multiplicity fluctuations. We measured the absorption spectra in polycrystalline and nanostructured samples in the temperature range 3–550 K and found a quite strong breathing mode softening that cannot be explained by standard lattice anharmonicity. We showed that the anharmonicity in the electron–phonon interaction is responsible for this red shift proportional to the nHS concentration.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Nesterov A. I., Orlov Yu. S., Ovchinnikov S. G., Nikolaev S. V.
Заглавие : Cooperative phenomena in spin crossover systems [Electronic resource]
Место публикации : ArXiv. - 2016. - Ст.1611.10009
Вид и объем ресурса: Electronic text data
Примечания : Cited References: 60. - This work was supported by RFBR and Government of Krasnoyarsk Territory according to the research project 16-42-243048, 16-42-240413, 16-42-240746, by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools, project no. SP-1844.2016.1, NSh-7559.2016.2, Russian Foundation for Basic Research, project nos. 17-02-00826, 17-02-00052, 16-02-00507, 16-02-00098, 16-02-00273. A.I. Nesterov acknowledge the support from the CONACyT.
Аннотация: Within the framework of a realistic multi-band p-d-model, we derived an effective Hamiltonian to describe the exchange interaction effects near the spin crossover in magnetic Mott-Hubbard insulators under pressure. It is shown that single-ion mechanism of spin crossover under change of the crystal field does not lead to a thermodynamic phase transition, however, at T = 0 a quantum phase transition appears. It has been found that the cooperativity leads to a modification of the quantum phase transition to a first-order phase transition and the appearance of metastable states of the system. The pressure - temperature phase diagram has been obtained to describe the magnetization and high-spin population near the spin crossover of the Motts dielectrics with d6-ions.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Nesterov A. I., Orlov Yu. S., Ovchinnikov S. G., Nikolaev S. V.
Заглавие : Cooperative phenomena in spin crossover systems
Коллективы : Moscow International Symposium on Magnetism, Московский государственный университет им. М.В. Ломоносова, Российский фонд фундаментальных исследований
Место публикации : Moscow International Symposium on Magnetism (MISM-2017): 1-7 July 2017 : book of abstracts. - 2017. - Ст.4PO-K-41. - P.943 (Шифр 29916280)
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Nesterov A. I., Orlov Yu. S., Ovchinnikov S. G., Nikolaev S. V.
Заглавие : Cooperative phenomena in spin crossover systems
Коллективы : Russian Foundation for Basic Research; Krasnoyarsk Territory; Krasnoyarsk Region Science and Technology Support Fund for research Projects [16-42-243048, 16-42-240413, 16-42-240746, 16-43-240505]; Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools, Projects [SP-1844.2016.1, NSh-7559.2016.2]; Russian Foundation for Basic Research, Projects [16-02-00507, 16-02-00098, 16-02-00273]; CONACyT
Место публикации : Phys. Rev. B: American Physical Society, 2017. - Vol. 96, Is. 13. - Ст.134103. - ISSN 2469-9950, DOI 10.1103/PhysRevB.96.134103. - ISSN 2469-9969(eISSN)
Примечания : Cited References:85. - The reported study was funded by the Russian Foundation for Basic Research; the government of Krasnoyarsk Territory; the Krasnoyarsk Region Science and Technology Support Fund for research Projects No. 16-42-243048, No. 16-42-240413, No. 16-42-240746, and No. 16-43-240505; the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools, Projects No. SP-1844.2016.1 and No. NSh-7559.2016.2; and the Russian Foundation for Basic Research, Projects No. 16-02-00507, No. 16-02-00098, and No. 16-02-00273. A. I. N. acknowledges the support from CONACyT.
Предметные рубрики: ISING-LIKE MODEL
EARTHS LOWER MANTLE
MEAN-FIELD APPROACH
Аннотация: Within the framework of a realistic multiband p-d model, we derived an effective Hamiltonian to describe the exchange interaction effects near the spin crossover in magnetic Mott-Hubbard insulators under pressure. It is shown that the single-ion mechanism of spin crossover under the change in the crystal field does not lead to a thermodynamic phase transition; however, at T = 0 a quantum phase transition appears. It has been found that the cooperativity leads to a modification of the quantum phase transition to a first-order phase transition and the appearance of metastable states of the system. The pressure-temperature phase diagram has been obtained to describe the magnetization and high-spin population near the spin crossover of Mott's insulators with d6 ions.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Platunov M. S., Dudnikov V. A., Orlov Yu. S., Kazak N. V., Solovyov L. A., Zubavichus Y. V., Veligzhanin A. A., Dorovatovskii P. V., Vereshchagin S. N., Shaykhutdinov K. A., Ovchinnikov S. G.
Заглавие : Crystal structure and electronic states of Co and Gd ions in a Gd0.4Sr0.6CoO2.85 single crystal
Коллективы : Russian Foundation for Basic Research [13-02-00958, 13-02-00358, 14-02-31051, 16-32-60049]; Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools [SP-938.2015.5]; program "UMNIK"; Siberian Branch, Russian Academy of Sciences [V.45.3.1]
Место публикации : JETP Letters. - 2016. - Vol. 103, Is. 3. - P.196-200. - ISSN 0021-3640, DOI 10.1134/S0021364016030139. - ISSN 1090-6487(eISSN)
Примечания : Cited References:20. - This work was supported in part by the Russian Foundation for Basic Research (project nos. 13-02-00958, 13-02-00358, 14-02-31051, and 16-32-60049), by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project no. SP-938.2015.5), and by the program "UMNIK." The X-ray diffraction and thermochemical studies were supported by the Siberian Branch, Russian Academy of Sciences (project no. V.45.3.1).
Предметные рубрики: X-RAY-ABSORPTION
PROFILE REFINEMENT
PEROVSKITE
CHARGE
SPIN
Аннотация: X-ray diffraction and X-ray absorption near edge structure (XANES) spectra have been measured at the Со K-edge and Gd L3-edge in GdCoO3 and Gd0.4Sr0.6CoO2.85 cobaltites. The effect of Sr substitution on the crystal structure and electronic and magnetic states of Co3+ ions in a Gd0.4Sr0.6CoO2.85 single crystal has been analyzed. The XANES measurements at the Co K-edge have not showed a noticeable shift of the absorption edge with an increase in the concentration of Sr. This indicates that the effective valence of cobalt does not change. An increase in the intensity of absorption at the Gd L3-edge is due to an increase in the degree of hybridization of the Gd(5d) and O(2p) states. The effect of hole doping on the magnetic properties results in the appearance of the ferromagnetic component and in a significant increase in the magnetic moment.
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