DETERMINATION OF THE CRITICAL EXPONENT-BETA FROM MEASUREMENTS OF A WEAK SPONTANEOUS MAGNETIZATION IN THE 3D ISING ANTIFERROMAGNET FEF2

Authors
MATTSSON J DJURBERG C NORDBLAD P
Citation
J. Mattsson et al., DETERMINATION OF THE CRITICAL EXPONENT-BETA FROM MEASUREMENTS OF A WEAK SPONTANEOUS MAGNETIZATION IN THE 3D ISING ANTIFERROMAGNET FEF2, Journal of magnetism and magnetic materials, 136(1-2), 1994, pp. 120000023-120000028
Citations number
21
Categorie Soggetti
Material Science","Physics, Condensed Matter
Journal title
Journal of magnetism and magnetic materials → ACNP
ISSN journal
03048853
Volume
136
Issue
1-2
Year of publication
1994
Pages
120000023 - 120000028
Database
ISI
SICI code
0304-8853(1994)136:1-2<120000023:DOTCEF>2.0.ZU;2-Q
Abstract
The critical exponent for the order parameter, beta, has been determin ed from the temperature dependence of a weak spontaneous magnetisation that appears below the Neel temperature in the prototypical 3d Ising antiferromagnet FeF2. The derived value of beta = 0.325 +/- 0.002 agre es with the theoretically calculated value for beta of a 3d Ising syst em. The very occurrence of a spontaneous magnetisation in pure FeF2 is assumed to be of piezomagnetic origin.