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Title: Phase transition to a commensurate magnetic structure in PrMn{sub 2}O{sub 5} oxide

On the basis of the experimentally obtained structure of the magnetic phase of the PrMn{sub 2}O{sub 5} oxide, it is found that in the temperature interval from 18 to 25 K, a transition to this phase should be analytically described by a two-component order parameter and that the effective Hamiltonian of the system should contain two independent fourth-order invariants with respect to the components of this parameter. With the use of the results of renormalization group analysis of phase transitions with this effective Hamiltonian, which are known from the literature, it is established that a second-order transition occurs. It is shown that the commensurate antiferromagnetic phase resulting from this transition has no electric polarization because this polarization is forbidden by the symmetry of the system.
Authors:
 [1]
  1. Russian Academy of Sciences, Mikheev Institute of Metal Physics, Ural Branch (Russian Federation)
Publication Date:
OSTI Identifier:
22472221
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Experimental and Theoretical Physics; Journal Volume: 120; Journal Issue: 6; Other Information: Copyright (c) 2015 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIFERROMAGNETISM; HAMILTONIANS; MANGANATES; ORDER PARAMETERS; PHASE TRANSFORMATIONS; POLARIZATION; PRASEODYMIUM COMPOUNDS; RENORMALIZATION; SYMMETRY; TEMPERATURE DEPENDENCE