Magnetic neutron-scattering investigation of the field-induced Griffiths phase in FeCl₂

Authors

Christian Binek, University of Nebraska-LincolnFollow
D. Bertrand, Laboratoire de Physique des Solides, Toulouse, France
L.P. Regnault, Centre D’Etudes Nucle´aires, De´partment de Recherche Fondamentale sur la Matie`re Condense´e–Service de Physique Statistique,
Wolfgang Kleemann, Angewandte Physik, Gerhard-Mercator-Universita¨t Duisburg, D-47048 Duisburg, GermanyFollow

Date of this Version

10-1-1996

Comments

Published by American Physical Society. Copyright 1996. Permission to use. Phys. Rev. B 54, 9015 (1996).

Abstract

Quasielastic neutron scattering has been utilized to investigate the Griffiths phase induced by an axial magnetic field in FeCl₂ at temperatures T_c(H)⩽T⩽T_N, where T_c(H) is the transition temperature in an external magnetic field H. We present the temperature dependence of the integrated neutron-scattering intensity at fixed scattering vectors for various magnetic fields. On cooling below T_N the antiferromagnetic short-range fluctuations decrease due to an increase of the volume fraction which is already antiferromagnetically ordered. A weighted average of the local contributions to the antiferromagnetic susceptibility quantitatively describes the scattering cross section.