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Ferrimagnetism of MnV(2)O(4) spinel.

Authors
  • Karchev, Naoum
Type
Published Article
Journal
Journal of physics. Condensed matter : an Institute of Physics journal
Publication Date
Feb 04, 2009
Volume
21
Issue
5
Pages
56008–56008
Identifiers
DOI: 10.1088/0953-8984/21/5/056008
PMID: 21817314
Source
Medline
License
Unknown

Abstract

The spinel MnV(2)O(4) is a two-sublattice ferrimagnet, with site A occupied by the Mn(2+) ion and site B by the V(3+) ion. The magnon of the system, the transversal fluctuation of the total magnetization, is a complicated mixture of the sublattice A and B transversal magnetic fluctuations. As a result, the magnons' fluctuations suppress in a different way the manganese and vanadium sublattice magnetization and one obtains two phases. At low temperature (0,T(*)) the sublattice Mn magnetization and sublattice V magnetization contribute to the magnetization of the system, while at a high temperature (T(*),T(N)), the vanadium sublattice magnetization is suppressed by magnon fluctuations, and only the manganese ions have non-zero spontaneous magnetization. A modified spin-wave theory is developed to describe the two phases and to calculate the magnetization as a function of temperature. The anomalous M(T) curve reproduces the experimentally obtained zero-field-cooled (ZFC) magnetization.

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