Magnetic and ferroelectric ordering in BiMn{sub 2}O{sub 5} oxide

Journal Article · Fri Jan 15 00:00:00 EST 2016 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776115130051· OSTI ID:22617331

Menshenin, V. V., E-mail: [e-mail] ^[1]

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1. Russian Academy of Sciences, Mikheev Institute of Metal Physics, Ural Branch (Russian Federation)

A group-theoretical analysis of the magnetic phase of BiMn{sub 2}O{sub 5} oxide is performed using the space symmetry group of the compound. Using the projection operator method, we determine the basis functions of the irreducible representation of the space group, which are expressed in terms of the magnetic vector components. This representation can govern two phase transitions from the paramagnetic state to the antiferromagnetic phase with close temperatures and ordering of the spins of manganese ions in two crystallographic positions. It is found from renorm group analysis of these transitions that when these transitions occur as second- order transitions, the electric polarization does not appear in the system because spin fluctuations in this case elevate the symmetry of the system. Polarization appears when at least one of these transitions becomes a first-order transition as a result of spin fluctuations.

• OSTI ID: 22617331
• Journal Information: Journal of Experimental and Theoretical Physics, Vol. 122, Issue 1; Other Information: Copyright (c) 2016 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
ANTIFERROMAGNETISM
BISMUTH COMPOUNDS
CRYSTALLOGRAPHY
FERROELECTRIC MATERIALS
FLUCTUATIONS
IRREDUCIBLE REPRESENTATIONS
MAGNETIC PROPERTIES
MANGANATES
MANGANESE
OXIDES
PARAMAGNETISM
PHASE TRANSFORMATIONS
POLARIZATION
PROJECTION OPERATORS
SPACE GROUPS
SPIN