RANDOM-FIELD CRITICAL AND SPIN-FLOP BEHAVIOR OF THE ANISOTROPIC HEISENBERG-ANTIFERROMAGNET FE0.85MG0.15BR2 IN AXIAL MAGNETIC-FIELDS

Authors
KARSZEWSKI M KUSHAUER J BINEK C KLEEMANN W BERTRAND D
Citation
M. Karszewski et al., RANDOM-FIELD CRITICAL AND SPIN-FLOP BEHAVIOR OF THE ANISOTROPIC HEISENBERG-ANTIFERROMAGNET FE0.85MG0.15BR2 IN AXIAL MAGNETIC-FIELDS, Journal of physics. Condensed matter, 6(6), 1994, pp. 75-80
Citations number
27
Categorie Soggetti
Physics, Condensed Matter
Journal title
Journal of physics. Condensed matter → ACNP
ISSN journal
09538984
Volume
6
Issue
6
Year of publication
1994
Pages
75 - 80
Database
ISI
SICI code
0953-8984(1994)6:6<75:RCASBO>2.0.ZU;2-F
Abstract
Faraday optical measurements on the dilute hexagonal antiferromagnet F e0.85Mg0.15Br2 in an external axial field reveal a spin-flop phase lin e ending at a multicritical point (T-m = 8.1 K, H-m = 1050 kA m(-1)) a nd crossover from random-exchange to random-field Ising criticality wi th an exponent Phi = 1.40 +/- 0.04 in the vicinity of T-N = 11.1 K. Cu sp-like behaviour of the specific heat at T-N is discussed in view of recent Monte Carlo results.