Structural, Magnetic, and Thermodynamic Properties of Ordered and Disordered Cobaltite Gd{sub 0.1}Sr{sub 0.9}CoO{sub 3 – δ}

Journal Article · Mon Apr 15 00:00:00 EDT 2019 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776119020171· OSTI ID:22917759

Dudnikov, V. A.; Kazak, N. V.; Vereshchagin, S. N. ^[1]; Gavrilkin, S. Yu.; Tsvetkov, A. Yu. ^[2]; Gorev, M. V. ^[3]; Veligzhanin, A. A.; Trigub, A. L. ^[4]; Troyanchuk, I. O. ^[5]; Ovchinnikov, S. G. ^[3]

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1. Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences (Russian Federation)
2. Lebedev Physical Institute, Russian Academy of Sciences (Russian Federation)
3. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences (Russian Federation)
4. National Research Center Kurchatov Institute (Russian Federation)
5. Scientific and Practical Materials Research Center, National Academy of Sciences of Belarus (Belarus)

The effect of cationic and anionic orderings on the crystal structure and magnetic properties of substituted rare-earth cobaltites Gd{sub 0.1}Sr{sub 0.9}CoO{sub 3 – δ} was studied using X-ray diffraction, measurement of XANES spectra, and magnetic and thermodynamic characteristics. The effects of ordering cause a decrease in symmetry to tetragonal and a distortion of the coordination octahedra of CoO{sub 6}. Anomalous magnetic and thermodynamic quantities are observed at 260 and 360 K, respectively, for disordered and ordered samples. The XANES spectra measured at the CoK edge did not reveal a noticeable shift in the absorption edge compared with the spectrum of original GdCoO{sub 3}. This suggests that the charge compensation process is associated not only with a change in the electronic state of cobalt ions, but also with the emergence of holes in the 2p states of oxygen.

• OSTI ID: 22917759
• Journal Information: Journal of Experimental and Theoretical Physics, Vol. 128, Issue 4; Other Information: Copyright (c) 2019 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
ABSORPTION SPECTROSCOPY
COBALT COMPOUNDS
COBALT IONS
COMPARATIVE EVALUATIONS
CRYSTAL STRUCTURE
GADOLINIUM COMPOUNDS
MAGNETIC PROPERTIES
OXYGEN COMPOUNDS
P STATES
SPECTRA
STRONTIUM COMPOUNDS
SYMMETRY
THERMODYNAMIC PROPERTIES
THERMODYNAMICS
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY