Field-induced transverse spin ordering in FeBr₂

Authors

O. Petracie, Laboratorium fu¨r Angewandte Physik, Gerhard-Mercator-Universita¨t Duisburg, D-47048 Duisburg, Germany
Christian Binek, University of Nebraska-LincolnFollow
Wolfgang Kleemann, Laboratorium fu¨r Angewandte Physik, Gerhard-Mercator-Universita¨t Duisburg, D-47048 Duisburg, GermanyFollow
U. Neuhausen, Institut fu¨r Anorganische Chemie, Rheinisch-Westfa¨lische Technische Hochschule, Aachen, Germany
H. Lueken, Institut fu¨r Anorganische Chemie, Rheinisch-Westfa¨lische Technische Hochschule, Aachen, Germany

Date of this Version

5-1-1998

Comments

Published by American Physical Society. Copyright 1998. Permission to use. Phys. Rev. B 57, R 11051 (1998).

Abstract

Weak first-order phase transitions from axial to oblique spin ordering in FeBr2 are evidenced by superconducting quantum interference device magnetometry in axial fields H₁(T) above the multicritical point, H_m=2.4 MA/m, T_m=4.6 K, and below the antiferro-to-paramagnetic phase line, H_c (T), in agreement with recent specific-heat data [H. Aruga Katori, K. Katsumata, and M. Katori, Phys. Rev. B 54, R9620 (1996)]. The ordering of the in-plane moments is probably due to nondiagonal coupling to the longitudinal ones, both of which increase discontinuously at H₁ (T) only under an additional symmetry-breaking transverse field.