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1.
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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2.
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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3.
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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4.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Aplesnin S. S., Ryabinkina L. I., Romanova O. B., Har'kov A. M., Gorev M. V., Balaev A. D., Eremin E. V., Bovina A. F.
Заглавие
: The magnetoelastic effect in CoxMn1-xS solid solutions
Коллективы
:
Разночтения заглавия
:авие SCOPUS: The magnetoelastic effect in Cox Mn1 - x S solid solutions
Место публикации
: Solid
State
Commun.: PERGAMON-ELSEVIER SCIENCE LTD, 2010. - Vol. 150, Is. 13-14. - P564-567. - ISSN 0038-1098,
DOI
10.1016/j.ssc.2010.01.009
Примечания
: Cited References: 13. - This work was supported by the Russian Foundation for Basic Research projects no. 08-02-00364-a, no. 08-02-90031, no. F08037, F08-229, and no. 09-02-00554-a.
Предметные рубрики:
YVO3 SINGLE-CRYSTAL
SPIN
-
STATE
TRANSITION
TRANSPORT
PHYSICS
LACOO3
Ключевые слова
(''Своб.индексиров.''): semiconductors--x-ray scattering--galvanomagnetic effects--thermal expansion--semiconductors--x-ray scattering--galvanomagnetic effects--thermal expansion--semiconductors--x-ray scattering--coefficient of thermal expansion--magnetoelastic effects--orbital ordering--temperature hysteresis--temperature range--zero magnetic fields--crystallization--electric resistance--magnetic field effects--magnetoresistance--manganese--manganese compounds--neon--organic polymers--scattering--semiconductor quantum dots--solid solutions--solidification--thermal stress--x ray scattering--thermal expansion
Аннотация:
The magnetization of cation-substituted CoxMn(1-x)S sulfides upon cooling in zero magnetic field and in a field in the temperature range 4-300 K has been measured and the resistance versus magnetic field (up to 10 kOe) dependences have been obtained. Magnetoresistance and temperature hysteresis of magnetization versus prehistory are found at the magnetic field H 0.1 T and at T 240 K. The interrelation between the magnetic and elastic subsystems of the CoxMn1-xS solid solutions has been established. A jump in the coefficient of thermal expansion is observed at the Neel temperature. The features of the physical properties are explained by orbital ordering. (C) 2010 Elsevier Ltd. All rights reserved.
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5.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Ivanova N. B., Kazak N. V., Michel C. R., Balaev A. D., Ovchinnikov S. G.
Заглавие
: Low-temperature magnetic behavior of the rare-earth cobaltites GdCoO3 and SmCoO3
Разночтения заглавия
:авие SCOPUS: Low-temperature magnetic behavior of the rare-earth cobaltites GdCoO 3 and SmCoO3
Место публикации
: Phys. Solid
State
: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2007. - Vol. 49, Is. 11. - P2126-2131. - ISSN 1063-7834,
DOI
10.1134/S1063783407110182
Примечания
: Cited References: 32. - This study was supported by the Branch of General Physics and Astronomy of the Russian Academy of Sciences within the framework of the program “Strong Electron Correlations” and the Russian Science Support Foundation
Предметные рубрики:
METAL-INSULATOR-TRANSITION
RCOO3 R
SPIN
-
STATE
OXIDE
SM
ND
PEROVSKITE
GLASSES
PR
EU
Аннотация:
The temperature and magnetic field dependences of the static magnetization of the polycrystalline rare-earth cobaltites GdCoO3 and SmCoO3 have been measured. It is shown that, below room temperature, the magnetization of both compounds derives primarily from the rare-earth ion paramagnetism. The GdCoO3 and SmCoO3 compounds have been found to differ substantially in magnetic behavior, which can be traced to differences in their electronic shell structures. The magnetic behavior of GdCoO3 is close to that of an array of free Gd3+ ions, whereas in SmCoO3 the deviation from the free-ion properties is very large because of the Sm3+ ground
state
being crystal-field split. Van Vleck magnetic susceptibility measurements of SmCoO3 suggest that the splitting is similar to 10 K.
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