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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Orlov Y. S.
Заглавие : Magnetoresistance of LaCoO3 and an insulator-metal transition induced in it by a high magnetic field
Место публикации : JETP Letters. - 2011. - Vol. 92, Is. 9. - P.613-617. - ISSN 0021-3640, DOI 10.1134/S0021364010210095
Примечания : Cited References: 13. - This work was supported by the Division of Physical Sciences, Russian Academy of Sciences (program no. 2.3); by the Siberian and Ural Branches, Russian Academy of Sciences (joint project no. 40); by the Ministry of Education and Science of the Russian Federation (state contract no. P891, federal program "Scientific and Pedagogical Personnel of Innovative Russia"); by the Russian Foundation for Basic Research (project nos. 09-02-00171 and 10-02-00251); and by the Dynasty Foundation.
Предметные рубрики: SPIN-STATE
Аннотация: The transformation of the band structure of LaCoO3 in the applied magnetic field has been theoretically studied. If the field is below its critical value B (C) a parts per thousand 65 T, the dielectric band gap decreases with the field, thus giving rise to negative magnetoresistance that is highest at T a parts per thousand integral 300-500 K. The critical field is related to the crossover between the low- and high-spin terms of Co3+ ions. The spin crossover results in an insulator-metal transition induced by an increase in the magnetic field.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Orlov Y. S., Nekrasov I. A., Pchelkina Z. V.
Заглавие : Electronic structure, magnetic properties, and mechanism of the insulator-metal transition in LaCoO3 taking into account strong electron correlations
Разночтения заглавия :авие SCOPUS: Electronic structure, magnetic properties, and mechanism of the insulator-metal transition in LaCoO 3 taking into account strong electron correlations
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 112, Is. 1. - P140-151. - ISSN 1063-7761, DOI 10.1134/S1063776110061159
Примечания : Cited References: 36. - This study was supported financially by the Siberian and Ural Branches of the Russian Academy of Sciences (Integration Project no. 40), Department of Physics of the Russian Academy of Sciences (Program 2.3), Russian Foundation for Basic Research (Project nos. 09-02-00171-a and 10-02-00251), and Noncommercial "Dynasty" Foundation.
Предметные рубрики: SPIN-STATE TRANSITION
CHARGE
Ключевые слова (''Своб.индексиров.''): energy spectra--excited energy level--finite temperatures--gap state--gap widths--high temperature--high-temperature anomalies--insulator metal transition--pauli contribution--spin crossovers--strong electron correlations--temperature dependence--total magnetization--cobalt compounds--density functional theory--electron correlations--electron density measurement--electronic properties--electronic structure--magnetic susceptibility--semiconductor insulator boundaries--spectroscopy--metal insulator transition
Аннотация: The electronic structure of LaCoO3 at finite temperatures is calculated using the LDA+GTB method taking into account strong electron correlations and possible spin crossover upon an increase in temperature. Gap states revealed in the energy spectrum of LaCoO3 reduce the dielectric gap width upon heating; this allowed us to describe the insulator-metal transition observed in this compound at T = 500-600 K. The temperature dependence of the magnetic susceptibility with a peak at T a parts per thousand 100 K is explained by the Curie contribution from thermally excited energy levels of the Co3+ ion. At high temperatures, the Pauli contribution from a band electron is added and the total magnetization of LaCoO3 is considered as the sum M (tot) = M (loc) + M (band). The second term describes the band contribution appearing as a result of the insulator-metal transition and facilitating the emergence of a high-temperature anomaly in the magnetic susceptibility of LaCoO3.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ding Y., Haskel D., Ovchinnikov S. G., Tseng Y. C., Orlov Y. S., Lang J. C., Mao H. K.
Заглавие : Novel pressure-induced magnetic transition in magnetite (Fe(3)O(4))
Разночтения заглавия :авие SCOPUS: Novel pressure-induced magnetic transition in magnetite (Fe3O4)
Место публикации : Phys. Rev. Lett.: AMER PHYSICAL SOC, 2008. - Vol. 100, Is. 4. - Ст.45508. - ISSN 0031-9007, DOI 10.1103/PhysRevLett.100.045508
Примечания : Cited References: 39
Предметные рубрики: MULTIPLE-SCATTERING THEORY
X-RAY DICHROISM
LOWER MANTLE
VERWEY TRANSITION
K-EDGE
CIRCULAR-DICHROISM
SPIN TRANSITION
BAND-STRUCTURE
IRON
FE
Ключевые слова (''Своб.индексиров.''): emission spectroscopy--magnetoelectronics--pressure effects--synchrotron radiation--diamond anvil cell--magnetic transition--x-ray magnetic circular dichroism--magnetite
Аннотация: Fe K-edge x-ray magnetic circular dichroism of magnetite (Fe(3)O(4)) powders was measured with synchrotron radiation under variable pressure and temperature conditions in diamond anvil cell. The magnetic dichroism was observed to decrease discontinuously by similar to 50% between 12 and 16 GPa, independent of temperature. The magnetic transition is attributed to a high-spin to intermediate-spin transition of Fe(2+) ions in the octahedral sites and could account for previously observed structural and electrical anomalies in magnetite at this pressure range. The interpretation of x-ray magnetic circular dichroism data is supported by x-ray emission spectroscopy and theoretical cluster calculations.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Orlov Y. S., Ovchinnikov S. G.
Заглавие : Construction of a Multielectron Basis for Mott Insulators with Strong Electron Correlations, Spin-Orbit Interaction, and Covalence
Место публикации : J. Exp. Theor. Phys. - 2009. - Vol. 109, Is. 2. - P.322-338. - ISSN 1063-7761, DOI 10.1134/S1063776109080196
Примечания : Cited References: 35
Предметные рубрики: NARROW ENERGY BANDS
MAGNETIC ANISOTROPY ENERGY
ORIGIN
TRANSITION
PHYSICS
MANGANITES
OXIDES
CHARGE
Аннотация: We propose that the apparatus of quantum mechanics of a free atom (in particular, the theory of nj symbols and Rakah-Wigner genealogic coefficients generalized to the case of point groups and widely used in crystal field theory) be used for constructing multielectron bases with allowance for covalence and spin-orbit interaction. This allows us to take into account the electron-electron interaction for 3d ions the most comprehensively. The basis constructed in this way can be used in the generalized strong coupling method for the multiband p-d model in describing the structure of the quasiparticle energy spectrum and physical properties of systems with strong electron correlations. The procedure of construction and computation is demonstrated for the (5)T(2g) term in the d(6) configuration of the transition metal atom in an octahedral field. The mechanism for the emergence of magnetic anisotropy in S ions (Fe(3+) and Mn(2+)) due to covalent mixing of d(6) (L) under bar configurations with a nonzero orbital angular momentum ((L) under bar is a hole in ligands) is demonstrated
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