Random-field critical and spin-flop behavior of the anisotropic Heisenberg antiferromagnet Fe0.9Mg0.1Br2 in axial magnetic fields

Authors

Christian Binek, University of Nebraska-LincolnFollow

Date of this Version

February 1994

Comments

Published in the Journal of Physics: Condensed Matter, February 7, 1994.

Abstract

Faraday optical measurements on the dilute hexagonal antiferromagnet Fe0.85Mg0.15Br2 in an external axial field reveal a spin-flop phase line ending at a multicritical point (Tm=8.1 K, Hm=1050 kA m-1) and crossover from random-exchange to random-field Ising criticality with an exponent Phi =1.40+or-0.04 in the vicinity of TN=11.1 K. Cusp-like behaviour of the specific heat at TN is discussed in view of recent Monte Carlo results.