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Structural and magnetic phase transitions in Pr.sub.0.7./sub.Ca.sub.0.3./sub.MnO.sub.3./sub. at high pressures
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SYSNO ASEP 0356861 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Structural and magnetic phase transitions in Pr0.7Ca0.3MnO3 at high pressures Author(s) Kozlenko, D. P. (RU)
Chan, T.A. (RU)
Kichanov, S.E. (RU)
Jirák, Zdeněk (FZU-D) RID, ORCID, SAI
Dubrovinsky, L.S. (DE)
Savenko, B. N. (RU)Source Title JETP Letters. - : MAIK Nauka - Interperiodica - ISSN 0021-3640
Roč. 92, č. 9 (2010), 590-594Number of pages 5 s. Language eng - English Country US - United States Keywords high pressure ; crystal structure ; magnetic structure ; phase transition Subject RIV BM - Solid Matter Physics ; Magnetism CEZ AV0Z10100521 - FZU-D (2005-2011) UT WOS 000286335700005 DOI 10.1134/S0021364010210058 Annotation The crystal structure and Raman spectra of Pr0.7Ca0.3MnO3 manganite at high pressures of up to 30 GPa and the magnetic structure at pressures of up to 1 GPa have been studied. A structural phase transition from the orthorhombic phase of the Pnma symmetry to the high-pressure orthorhombic phase of the Imma symmetry has been observed at P ~ 15 GPa and room temperature. Anomalies of the pressure dependences of the bending and stretching vibrational modes have been observed in the region of the phase transition. A magnetic phase transition from the initial ferromagnetic ground state (TC = 120 K) to the A-type antiferromagnetic state (TN = 140 K) takes place at a relatively low pressure of P = 1 GPa in the low-temperature region. The structural mechanisms of the change of the character of the magnetic ordering have been discussed. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2011
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