Magnetic structures determined by neutron diffraction in the EuBϵ−xCx system |
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| Authors: | JM Tarascon JL Soubeyroux J Etourneau R Georges JMD Coey O Massenet |
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| Institution: | 1. Laboratoire de Chimie du Solide du CNRS, Université de Bordeaux I, 351 Cours de la Libération, 33405 Talence Cedex,France;2. Laboratoire de Chimie du Solide du CNRS, Université de Bordeaux I, 351 Cours de la Libération, 33405 Talence Cedex,France;3. Laboratoire de Chimie du Solide du CNRS, Université de Bordeaux I, 351 Cours de la Libération, 33405 Talence Cedex,France;5. Department of Pure and Applied Physics, University of Dublin, Trinity College, Dublin 2, Ireland;6. Groupe des Transitions de Phases du CNRS, 166X 38042 Grenoble Cedex,France |
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| Abstract: | Magnetic structures of pure and carbon-doped europium hexaboride EuB6?xCx, were determined by neutron diffraction on powders prepared from 11B and 153Eu. EuB6 is a simple ferromagnet, whereas the x = 0.20 compound has an incommensurate spiral structure with propagation vector τ = (0.28, 0, 0). Data for a magnetically inhomogeneous intermediate composition, x = 0.05, indicate a mixture of ferromagnetic and helimagnetic domains with τ = (0, 0, 0.104). Helimagnetism in EuB6?xCx arises from a competition between ferromagnetic near-neighbour exchange and antiferromagnetic interactions due to conduction electrons. |
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