Publication
Title
Neel temperature of antiferromagnets for phase transitions driven by spin-wave interactions
Author
Abstract
In a recent article,1 a wide variety of phase transitions, with transition (t) temperature T-t, were shown to be usefully characterized by the form k(B)T(t) = E-char exp(-1/vertical bar lambda vertical bar) where vertical bar lambda vertical bar measured the strength of the quasiparticle interactions driving the phase transition. The present article is concerned primarily with antiferromagnets (AFs) having Neel temperature T-N. It is first argued that the characteristic energy E-char can be usefully represented by k(B)theta, where theta is the Curie-Weiss temperature. This assertion is then confronted with experimental data on four insulating transition metal oxides, these being selected as all having the paramagnetic ions on a facecentered cubic lattice. For four of the five theta/T-N is certainly greater than unity, the fifth having the ratio as unity to within experimental error. vertical bar lambda vertical bar is then argued to be related to physical parameters entering a mean field approximation to AFs. Finally, the above insulating Afs are complemented by a brief discussion of a metallic FeRh alloy where, in addition to having itinerant electrons and antiferromagnetism, elevating the temperature leads to a transition from an AF to a ferromagnetic state.
Language
English
Source (journal)
Croatica chemica acta. - Zagreb
Publication
Zagreb : 2013
ISSN
0011-1643
Volume/pages
86:4(2013), p. 463-467
ISI
000330085600014
Full text (Publishers DOI)
Full text (open access)
UAntwerpen
Faculty/Department
Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 07.03.2014
Last edited 01.04.2017
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