Document Type

Article

Publication Date

12-1-1995

Keywords

Antiferromagnet, FeBr2, Mössbauer spectroscopy

Abstract

The antiferromagnet FeBr2 has been studied by Mössbauer spectroscopy in external fields both in the metamagnetic region below the multicritical temperature TMCP and in the second-order transition region above. The local magnetization shows that the metamagnetic transition occurs by spin flips, as in simple models. However, in the second-order transition region, the local magnetization of the sublattice oriented antiparallel to the external field varies continuously but remains parallel to the c axis. This can only be understood if the external magnetic field induces strong transversal spin precession of the moments on the antiparallel sublattice. This shows that the anomalous maxima in the imaginary part χ'' recently found in the ac susceptibility [M.M. Pereira de Azevedo et al., J. Magn. Magn. Mater. 140-144, 1557 (1995)] and denoted H_ below the critical field HC(T), and H+ above, can be understood as being caused by noncritical transversal spin fluctuations.

Publication Title

Physical Review B

Volume

52

Issue

21

First Page

15372

DOI

10.1103/PhysRevB.52.15372

Required Publisher's Statement

©1995 American Physical Society

DOI:https://doi.org/10.1103/PhysRevB.52.15372

Subjects - Topical (LCSH)

Antiferromagnetism; Magnetism; Iron-manganese alloys--Magnetic properties; Neutrons--Diffraction; Mössbauer spectroscopy

Genre/Form

articles

Type

Text

Rights

Copying of this document in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this document for commercial purposes, or for financial gain, shall not be allowed without the author’s written permission.

Language

English

Format

application/pdf

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