Eur. Phys. J. B 9, 613-618 (1999)
https://doi.org/10.1007/s100510050805

Magnetic interactions in the monoclinic ludwigite Cu₂FeO₂BO₃

¹ Instituto de Física, Universidade Federal Fluminense, Campus da Praia Vermelha, Niterói, 24210-340, RJ, Brazil
² Departamento de Física, Pontifícia Universidade Católica do Rio de Janeiro, Rio de Janeiro, 22452-970, RJ, Brazil
³ Centre de Recherches sur les Très Basses Temperatures-CNRS, 25 avenue des Martyrs, BP 166, 38042 Grenoble Cedex 9, France
⁴ Laboratoire des Propriétés Électroniques des Solides-CNRS, 25 avenue des Martyrs, BP 166, 38042 Grenoble Cedex 9, France
⁵ Instituto de Física, Universidade Federal do Rio Grande do Sul, avenue Bento Gonçalves, 9500, Porto Alegre, 91501-970, RS, Brazil

Corresponding author: ^a mucio@if.uff.br

Received: 25 September 1998
Published online: 15 June 1999

Abstract

The system Cu₂FeO₂BO₃ is an oxyborate belonging to the family of the ludwigites. In this paper we present AC susceptibility, magnetization measurements and Mössbauer spectroscopy on this material which allows for a complete characterization of its complex magnetic behavior. We find an hierarchy of interactions which clearly defines three regimes with decreasing temperature. These are associated with, the freezing of the Fe moments, the antiferromagnetic ordering of the Cu sub-lattice and finally the coupling between both systems.