Magnetic phase diagram of the diluted metamagnet Fe_0.95Mg_0.05Br₂

Authors

H. Aruga Katori, RIKEN (The Institute of Physical and Chemical Research), Wako, Saitama, Japan
K. Katsumata, RIKEN (The Institute of Physical and Chemical Research), Wako, Saitama 351-0198, Japan
O. Petracic, Laboratorium fu¨r Angewandte Physik, Gerhard-Mercator-Universita¨t, Duisburg, Germany
Wolfgang Kleemann, Laboratorium fu¨r Angewandte Physik, Gerhard-Mercator-Universita¨t, Duisburg, GermanyFollow
T. Kato, Laboratorium fu¨r Angewandte Physik, Gerhard-Mercator-Universita¨t, Duisburg, Germany
Christian Binek, University of Nebraska-LincolnFollow

Date of this Version

3-14-2001

Comments

Published by American Physical Society. Copyright 2001. Permission to use. Phys. Rev. B 63, 1324 (2001).

Abstract

The axial magnetic phase diagram of the antiferromagnet Fe_0.95Mg_0.05Br₂ is studied by specific heat, superconducting quantum interference device, and Faraday rotation techniques. The diamagnetic impurities give rise to random-field criticality along the second-order phase line H_c(T) between T_N=13.1 K and a multicritical point at T_m≈5 K, and to a spin-flop line between T_m and the critical end-point temperature T_e≈3.5 K. The phase line H₁(T)c(T) ending at T_m is probably due to symmetric nondiagonal exchange.