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Role of thermal vibrations in magnetic phase transitions

DSpace at IIT Bombay

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Field Value
 
Title Role of thermal vibrations in magnetic phase transitions
 
Creator PRASANNA, TRS
 
Subject magnetic phase transition
electron-phonon interaction
thermal vibrations
magnetic neutron diffraction
TEMPERATURE-DEPENDENCE
NEUTRON-DIFFRACTION
NEEL TEMPERATURE
BAND-STRUCTURE
SUPEREXCHANGE
FERROMAGNET
FERRITES
SPECTRA
SYSTEMS
SOLIDS
 
Description This article addresses the contradiction that exists in studies on magnetic phase transitions between theoretical models that ignore the role of thermal vibrations and analysis of neutron diffraction data that always incorporates them. Ignoring thermal vibrations in both theoretical models and analysis of diffraction data leads to the latter giving different magnetic-order parameters for different reciprocal lattice lines. This leads to a unique consequence, the assumption to neglect a physical phenomenon turns a single-valued experimental observable into a multiple-valued one where all values are equally valid. This assumption is clearly unacceptable and must be rejected. Diffraction data constrain all theoretical models to incorporate thermal vibrations and represent the exchange interaction as temperature dependent, J(ij)(T), instead of the current practice, J(ij)(0).
 
Publisher TAYLOR & FRANCIS LTD
 
Date 2014-10-15T12:49:09Z
2014-10-15T12:49:09Z
2012
 
Type Article
 
Identifier PHASE TRANSITIONS, 85(9)751-760
http://dx.doi.org/10.1080/01411594.2012.678356
http://dspace.library.iitb.ac.in/jspui/handle/100/14928
 
Language en