Библиотека института физики им. Л.В. Киренского СО РАН

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Каталог книг и брошюр библиотеки ИФ СО РАН

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Труды сотрудников ИФ СО РАН

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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 : Physics, Applied/C94
Автор(ы) : Korshunov M. M., Ovchinnikov S. G., Shneyder E. I., Gavrichkov V. A., Orlov Yu.S., Nekrasov I. A., Pchelkina Z. V.
Заглавие : Cuprates, manganites and cobaltites: Multielectron approach to the band structure
Место публикации : Mod. Phys. Lett. B: WORLD SCIENTIFIC PUBL CO PTE LTD, 2012. - Vol. 26, Is. 24. - Ст.1230016. - ISSN 0217-9849, DOI 10.1142/S0217984912300165
Примечания : Cited References: 93. - We are thankful to O. K. Andersen, V. I. Anisimov, A. F. Barabanov, K. I. Kikoin, N. M. Plakida, S. Sakai, A.-M.S. Tremblay, V. V. Val'kov, and R. O. Zaitsev for useful discussions. This work was supported by the Presisium of RAS program Quantum physics of condensed matter N 20.7, Grant "Leading scientific schools of Russia" (NSh 1044-2012.2), RFBR (Grant No. 09-02-00127), Integration Grant of SBRAS-UrBRAS N 44, Grant of President of Russia MK-1683.2010.2, FCP Scientific and Research-and-Educational Personnel of Innovative Russia for 2009-2013 (GK 16.740.12.0731 and GK 16.740.11.0740), and Siberian Federal University (Theme N F-11). M.M.K. and E.I.S. acknowledges support from The Dynasty Foundation and ICFPM.
Предметные рубрики: HIGH-TEMPERATURE SUPERCONDUCTORS
MEAN-FIELD THEORY
DENSITY-FUNCTIONAL FORMALISM
CORRELATED ELECTRON-SYSTEMS
TRANSITION-METAL COMPOUNDS
SPIN-STATE TRANSITION
T-J MODEL
MAGNETIC-PROPERTIES
COPPER OXIDES
LaCoO3
Ключевые слова (''Своб.индексиров.''): lda plus gtb method--strongly-correlated systems--band structure
Аннотация: High-T-c superconductors with CuO2 layers, manganites La1-xSrxMnO3 and cobaltites LaCoO3 present several mysteries in their physical properties. Most of them are believed to come from the strongly-correlated nature of these materials. From the theoretical viewpoint, there are many hidden rocks in making the consistent description of the band structure and low-energy physics starting from the Fermi-liquid approach. Here, we discuss the alternative method - multielectron approach to the electronic structure calculations for the Mott insulators - called LDA + GTB (local density approximation + generalized tight-binding) method. Its origin is a straightforward generalization of the Hubbard perturbation theory in the atomic limit and the multiband p - d Hamiltonian with the parameters calculated within LDA. We briefly discuss the method and focus on its applications to cuprates, manganites and cobaltites.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Babkin R.Yu., Lamonova K. V., Orel S. M., Ovchinnikov S. G., Pashkevich Y. G.
Заглавие : Temperature dependence of the spin state of a Co3+ Ion in RCoO3 (R = La, Gd) cobaltites
Коллективы : Russian-Ukrainian project [27-02-12]; National Academy of Sciences of Ukraine [91/14-N]; Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools [NSh-2886.2014.2]; Presidium of the Russian Academy of Sciences [216]; Russian Foundation of the Basic Research [13-02-00358]
Место публикации : JETP Letters. - 2014. - Vol. 99, Is. 8. - P.476-480. - ISSN 0021-3640, DOI 10.1134/S0021364014080037. - ISSN 1090-6487
Примечания : Cited References: 16. - This work was supported by the Russian-Ukrainian project no. 27-02-12, by the National Academy of Sciences of Ukraine (complex basic research project no. 91/14-N), by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project no. NSh-2886.2014.2), by the Presidium of the Russian Academy of Sciences (project no. 216), and by the Russian Foundation of the Basic Research (project no. 13-02-00358).
Предметные рубрики: EFFECTIVE NUCLEAR-CHARGE
TRANSITION
LACOO3
Аннотация: Changes in the spin state of Co3+ ions in LaCoO3 and GdCoO3 compounds are studied through the use of the temperature dependence of the magnetic susceptibility and the modified crystal field theory. It is shown that the spin subsystem of Co3+ ions in LaCoO3 and GdCoO3 undergoes the spin-crossover type transition between the high-spin (S = 2) and low-spin (S = 0) states without any contribution of the intermediate-spin state (S = 1).
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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) : Ovchinnikov S. G., Orlov Yu. S., Kuzubov A. A., Dudnikov V. A., Sokolov A. E., Zabluda V. N., Naumov S. B., Shestakov N. P.
Заглавие : Giant red shift of the absorption spectra due to nonstoichiometry in GdCoO3–δ
Коллективы : Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools [NSh-2886.2014.2]; Presidium of Russian Academy of Sciences [34]; Russian Foundation for Basic Research [16-02-00507, 16-02-00273, 16-02-00098, 14-02-00186]; Internationale Buro, Bundesministerium fur Bildung und Forschung (BMBF) [05K12GU2]
Место публикации : JETP Letters. - 2016. - Vol. 103, Is. 3. - P.161-166. - ISSN 0021-3640, DOI 10.1134/S0021364016030115. - ISSN 1090-6487(eISSN)
Примечания : Cited References:40. - This work was supported by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project no. NSh-2886.2014.2), by the Presidium of Russian Academy of Sciences (Program 34), by the Russian Foundation for Basic Research (project nos. 16-02-00507, 16-02-00273, 16-02-00098, and 14-02-00186), and by Internationale Buro, Bundesministerium fur Bildung und Forschung (BMBF, grant no. 05K12GU2).
Предметные рубрики: TRANSITION-METAL COMPOUNDS
TOTAL-ENERGY CALCULATIONS
AUGMENTED-WAVE METHOD
ELECTRONIC-STRUCTURE
MAGNETIC-PROPERTIES
SPIN TRANSITION
BAND-GAPS
BASIS-SET
LaCoO3
OXIDES
Аннотация: The GdCoO3–δ perovskite is a semiconductor with the energy gap Eg ≈ 0.5 eV from electrical transport measurements. It reveals unusual optical absorption spectra without transparency window expected for semiconductors. Instead we have measured the narrow transmittance peak at the photon energy ε0 = 0.087 eV. To reconcile the transport and optical data we have studied the effect of oxygen vacancies on the electronic structure of the GdCoO3–δ. We have found that oxygen vacancies result in the in-gap states inside the charge-transfer energy gap of the GdCoO3. It is a multielectron effect due to strong electron correlations forming the electronic structure of the GdCoO3–δ. These in-gap states decrease the transparency window and result in a narrow absorption minimum. The predicted temperature dependence of the absorption spectra has been confirmed by our measurements.
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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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivanova N. B., Kazak N. V., Michel C. R., Balaev A. D., Ovchinnikov S. G., Vasil'ev A. D., Bulina N. V., Panchenko E. B.
Заглавие : Effect of strontium and barium doping on the magnetic state and electrical conductivity of GdCoO3
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2007. - Vol. 49, Is. 8. - P1498-1506. - ISSN 1063-7834, DOI 10.1134/S1063783407080161
Примечания : Cited References: 36
Предметные рубрики: PEROVSKITE
ORDER
OXIDE
BEHAVIOR
GLASSES
LACOO3
PR
GD
SM
ND
Аннотация: A coordinated investigation of the magnetic and electrical properties of polycrystalline cobalt oxide compounds CdCoO3, Gd0.9Ba0.1CoO3, and Gd0.9Sr0.1CoO3 is carried out. Undoped GdCoO3 reveals a low conductivity; a magnetic moment of 7.4 mu(B) per molecule, which is less than the theoretical value for the Gd3+ ion; and an asymptotic Curie temperature of -6 K. Doping GdCoO3 with barium and strontium to substitution of 10 at. % Gd brings about an increase in the conductivity and magnetic transitions at T = 300 K for Gd0.9Ba0.1CoO3 and T = 170 K for Gd0.9Sr0.1CoO3. The magnetization anomalies imply the formation of magnetic clusters. The behavior of the electrical conductivity at high temperatures suggests a variable activation energy. At low temperatures, Mott hopping conduction sets in.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dudnikov V. A., Fedorov A. S., Orlov Yu. S., Solovyov L. A., Vereshchagin S. N., Gavrilkin, S. Yu, Tsvetkov, A. Yu, Gorev M. V., Novikov, S., V, Ovchinnikov S. G.
Заглавие : Thermoelectric properties of the SmCoO3 and NdCoO3 cobalt oxides
Коллективы : Russian Science FoundationRussian Science Foundation (RSF) [16-13-00060]
Место публикации : Ceram. Int. - 2020. - Vol. 46, Is. 11. - P.17987-17991. - ISSN 0272-8842, DOI 10.1016/j.ceramint.2020.04.113. - ISSN 1873-3956(eISSN)
Примечания : Cited References: 41. - This study was supported by the Russian Science Foundation, project no. 16-13-00060.
Предметные рубрики: MAGNETIC-PROPERTIES
SPIN
CONDUCTIVITY
TRANSITIONS
LACOO3
SITE
Аннотация: The thermoelectric properties of the NdCoO3 and SmCoO3 rare-earth cobalt oxides with a perovskite structure have been investigated in a wide temperature range. It is shown that, in the low-temperature region, the thermal conductivity of the compounds has a sharp maximum and the electrical conductivity of the samples increases with temperature, whereas the Seebeck coefficient behaves nonmonotonically with increasing temperature. The SmCoO3 oxide is characterized by the positive thermopower over the entire investigated range with a sharp growth in the low-temperature region, attaining the maximum value (S ≈ 1000 μV/K) near room temperature, and a further decrease. It has been established that, in the NdCoO3 oxide, the Seebeck coefficient changes its sign, which was rarely observed in the La-based compounds and is atypical of the undoped rare-earth cobalt oxides. The thermopower maximum obtained at a temperature of 450 K is 400 μV/K. The regions of the fastest growth of the thermoelectric power factor correspond to the anomalies caused by the spin transition of Со3+ ions and the dielectric–metal transition.
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