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This article is cited in 7 scientific papers (total in 7 papers)
CONDENSED MATTER
Structural and magnetic phase transitions occurring in Pr$_{0.7}$Sr$_{0.3}$MnO$_3$ manganite at high pressures
N. T. Dangab, D. P. Kozlenkoa, S. E. Kichanova, Л. С. Дубровинскиc, Z. Jirákd, D. M. Levinb, E. V. Lukina, B. N. Savenkoa a Joint Institute for Nuclear Research, Dubna, Moskovskaya obl.
b Tula State University
c Bayerisches Geoinstitut, Universität Bayreuth
d Institute of Physics AS CR, Prague
Abstract:
The crystal and magnetic structures and the vibrational spectra of Pr$_{0.7}$Sr$_{0.3}$MnO$_3$ manganite are studied within the pressure range up to $25$ GPa by methods of X-ray diffraction and Raman spectroscopy. Neutron diffraction studies have been performed at pressures up to $4.5$ GPa. The magnetic phase transition from the ferromagnetic phase ($T_{\text{C}}=273\,$K) to the A-type antiferromagnetic phase ($T_{\text{N}}=152\,$K) is found at $P\approx2\,$GPa. This transition is characterized by a broad pressure range corresponding to the phase separation. The Raman spectra of Pr$_{0.7}$Sr$_{0.3}$MnO$_3$ measured under high pressures significantly differ from the corresponding spectra of the isostructural doped A$_{1-x}$A'$_x$MnO$_3$ manganites, (where A is a rare-earth ion and A$'$ is an alkaline-earth ion) with the smaller average ionic radius $\langle r_{\text{A}}\rangle$ of A and A$'$ cations. Namely, the former spectra do not include clearly pronounced stretching phonon modes. At $P\sim7\,$GPa, there appears the structural phase transition from the orthorhombic phase with the $Pnma$ space group to the orthorhombic high-pressure phase with the $Imma$ symmetry. In the vicinity of the phase transition, anomalies in the pressure dependences of the lattice parameters, unit cell volume, and phonon frequencies corresponding to the characteristic lattice vibration modes are observed.
Received: 14.03.2013 Revised: 10.04.2013
Citation:
N. T. Dang, D. P. Kozlenko, S. E. Kichanov, Л. С. Дубровински, Z. Jirák, D. M. Levin, E. V. Lukin, B. N. Savenko, “Structural and magnetic phase transitions occurring in Pr$_{0.7}$Sr$_{0.3}$MnO$_3$ manganite at high pressures”, Pis'ma v Zh. Èksper. Teoret. Fiz., 97:9 (2013), 624–629; JETP Letters, 97:9 (2013), 540–545
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https://www.mathnet.ru/eng/jetpl3418 https://www.mathnet.ru/eng/jetpl/v97/i9/p624
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