Universität zu Köln

Babushkina, N. A., Taldenkov, A. N., Streltsov, S. V., Kalinov, A. V., Kuzmova, T. G., Kamenev, A. A., Kaul, A. R., Khomskii, D. I. and Kugel, K. I. (2014). Effect of Eu Doping and Partial Oxygen Isotope Substitution on Magnetic Phase Transitions in (Pr1-yEuy)(0.7)Ca0.3CoO3 Cobaltites. J. Exp. Theor. Phys., 118 (2). S. 266 - 279. NEW YORK: MAIK NAUKA/INTERPERIODICA/SPRINGER. ISSN 1090-6509

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Abstract

We study experimentally and theoretically the effect of Eu doping and partial oxygen isotope substitution on the transport and magnetic characteristics and spin-state transitions in (Pr1-yEuy)(0.7)Ca0.3CoO3 cobaltites. The Eu doping level y is chosen in the range of the phase diagram near the crossover between the ferromagnetic and spin-state transitions (0.10 < y < 0.20). We prepared a series of samples with different degrees of enrichment by the heavy oxygen isotope O-18, namely, with 90, 67, 43, 17, and 0% of O-18. Based on the measurements of the ac magnetic susceptibility chi(T) and electrical resistivity rho(T), we analyze the evolution of the sample properties with a change of the Eu and O-18 content. It is demonstrated that the effect of increasing the O-18 content on the system is similar to that of increasing the Eu content. The band structure calculations of the energy gap between t(2g) and e(g) bands including the renormalization of this gap due to the electron-phonon interaction reveals the physical mechanisms underlying this similarity.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Babushkina, N. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Taldenkov, A. N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Streltsov, S. V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kalinov, A. V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kuzmova, T. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kamenev, A. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kaul, A. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Khomskii, D. I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kugel, K. I. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-446071
DOI:	10.1134/S1063776114010026
Journal or Publication Title:	J. Exp. Theor. Phys.
Volume:	118
Number:	2
Page Range:	S. 266 - 279
Date:	2014
Publisher:	MAIK NAUKA/INTERPERIODICA/SPRINGER
Place of Publication:	NEW YORK
ISSN:	1090-6509
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language INTERMEDIATE-SPIN STATE; METAL TRANSITION; LACOO3; MANGANITES; EXCHANGE Multiple languages Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/44607