Low-Temperature Schottky Anomalies and the Magnetic State of the p Electrons of Oxygen in Substituted Gd0.4Sr0.6CoO3 – δ Cobaltites | Sciact - CRIS-system of Boreskov Institute of Catalysis

Low-Temperature Schottky Anomalies and the Magnetic State of the p Electrons of Oxygen in Substituted Gd0.4Sr0.6CoO3 – δ Cobaltites Full article

Journal

Journal of Experimental and Theoretical Physics
ISSN: 1063-7761 , E-ISSN: 1090-6509

Output data

Year: 2018, Volume: 126, Number: 2, Pages: 217-223 Pages count : 7 DOI: 10.1134/s1063776118020036

Tags

X-RAY-ABSORPTION; TRANSPORT-PROPERTIES; PROFILE REFINEMENT; SPIN; La1-XSrXCoO3; PEROVSKITE; TRANSITION; LaACoO3; CO

Authors

Orlov Yu.S. ^1,2 , Dudnikov V.A. ¹ , Platunov M.S. ¹ , Gorev M.V. ¹ , Velikanov D.A. ¹ , Kazak N.V. ¹ , Gavrilkin S.Yu. ³ , Solov’ev L.A. ⁴ , Veligzhanin A.A. ⁵ , Vereshchagin S.N. ⁴ , Ovchinnikov S.G. ¹

Affiliations

1	Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, ul. Akademgorodok 50/38, Krasnoyarsk, 660036 Russia
2	Siberian Federal University, Krasnoyarsk, 660041 Russia
3	Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991 Russia
4	Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, ul. Akademgorodok 50/24, Krasnoyarsk, 660036 Russia
5	Russian Research Centre “Kurchatov Institute,” pl. Kurchatova 1, Moscow, 123182 Russia

The XANES spectra (X-ray absorption near-edge spectra) at the K edge of Co and the L (3) edge of Gd in polycrystalline Gd0.4Sr0.6CoO3 - delta rare-earth oxides with an ordered and disordered distribution of Gd3+ and Sr2+ cations over the A sites in the crystal lattice are measured. The results of XANES measurements do not reveal a noticeable shift in the absorption edge with increasing Sr concentration as compared to the GdCoO3 parent composition. The measured temperature dependences of the heat capacity of polycrystalline ordered and disordered samples and a single-crystal ordered Gd0.4Sr0.6CoO2.85 sample exhibit two Schottky anomalies. These anomalies are thought to be related to the high-spin state of the Co3+ ions in the pyramidal environment caused by oxygen deficiency and to the magnetic state of oxygen p electrons induced by the doping-assisted generation of a hole in the 2p state. The absence of a noticeable shift in the absorption edge and the presence of two Schottky anomalies support the fact that the charge state of cobalt remains unchanged in the compounds under study.

Orlov Y.S. , Dudnikov V.A. , Platunov M.S. , Gorev M.V. , Velikanov D.A. , Kazak N.V. , Gavrilkin S.Y. , Solov’ev L.A. , Veligzhanin A.A. , Vereshchagin S.N. , Ovchinnikov S.G.
Low-Temperature Schottky Anomalies and the Magnetic State of the p Electrons of Oxygen in Substituted Gd0.4Sr0.6CoO3 – δ Cobaltites
Journal of Experimental and Theoretical Physics. 2018. V.126. N2. P.217-223. DOI: 10.1134/s1063776118020036 WOS Scopus РИНЦ ANCAN OpenAlex

Орлов Ю.С. , Дудников В.А. , Платунов М.С. , Горев М.В. , Великанов Д.А. , Казак Н.В. , Гаврилкин С.Ю. , Соловьёв Л.А. , Велигжанин А.А. , Верещагин С.Н. , Овчинников С.Г.
Низкотемпературные аномалии Шоттки и магнитное состояние p-электронов кислорода в замещенных кобальтитах Gd0.4Sr0.6CoO3−δ

Журнал экспериментальной и теоретической физики. 2018. Т.153. №2. С.259-267. DOI: 10.7868/S0044451018020086 РИНЦ OpenAlex

Submitted:	Jun 22, 2017
Published print:	Feb 1, 2018
Published online:	Apr 2, 2018

Web of science:	WOS:000428962100008
Scopus:	2-s2.0-85044823457
Elibrary:	35501610
Chemical Abstracts:	2018:676837
Chemical Abstracts (print):	171:505425
OpenAlex:	W2803056910

DB	Citing
Web of science	1
Scopus	1
OpenAlex	1