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Magnetic interactions in the monoclinic ludwigite Cu FeO BO |
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| Authors: | MA Continentino JC Fernandes RB Guimar aes HA Borges A Sulpice J-L Tholence JL Siqueira JBM da Cunha CA dos Santos |
| Institution: | Instituto de Física, Universidade Federal Fluminense, Campus da Praia Vermelha, 24210-340, Niterói, RJ, BR Departamento de Física, Pontifícia Universidade Católica do Rio de Janeiro, 22452-970, Rio de Janeiro, RJ, BR Centre de Recherches sur les Très Basses Temperatures-CNRS, 25 avenue des Martyrs, BP 166, 38042, Cedex 9, Grenoble, France, FR Laboratoire des Propriétés électroniques des Solides-CNRS, 25 avenue des Martyrs, BP 166, 38042, Cedex 9, Grenoble, France, FR Instituto de Física, Universidade Federal do Rio Grande do Sul, avenue Bento Gon?alves, 91501-970, Porto Alegre, RS, BR |
| Abstract: | The system Cu2FeO2BO3 is an oxyborate belonging to the family of the ludwigites. In this paper we present AC susceptibility, magnetization measurements and M?ssbauer 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. Received 25 September 1998 |
| Keywords: | PACS 75 30 Cr Saturation moments and magnetic susceptibilities - 75 10 Nr Spin-glass and other random models - 75 60 Ej Magnetization curves hysteresis Barkhausen and related effects - 76 80 +y M?ssbauer effect other -ray spectroscopy |
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