57Fe Mössbauer spectra and magnetic data from the kagomé antiferromagnet H3O-jarosite |
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| Authors: | P Bonville V Dupuis E Vincent P E Lippens A S Wills |
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| Institution: | (1) C.E.A.- Saclay, Service de Physique de l’Etat Condensé, URA 2464 (CNRS), 91191 Gif-sur-Yvette, France;(2) Laboratoire des Liquides Ioniques et Interfaces Chargées, Université Pierre et Marie Curie, 75006 Paris, France;(3) Laboratoire des Agrégats Moléculaires et Matériaux Inorganiques, UMR 5072 (CNRS), Université Montpellier II, 34095 Montpellier, France;(4) Department of Chemistry, University College London, 20 Gordon Street, London, WCIH 0AJ, UK |
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| Abstract: | 57Fe Mössbauer spectra are presented from (H3O)Fe3(SO4)2(OH)6 (or H3O-jarosite), which is a model kagomé antiferromagnet which features geometrical frustration and spin-glass-like behaviour. Dynamic scaling of the freezing temperature as a function of frequency is observed over a large frequency range, which indicates the presence of a spin-glass transition. A fast relaxation model between “up” and “down” states, separated by an energy gap, is presented to account for the shape of the Mössbauer spectra below the freezing temperature. From a calculation of the Electric Field Gradient tensor, it is suggested that H3O-jarosite is an XY-Heisenberg antiferromagnet, where the Fe3+ moments lie in the kagomé planes. |
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| Keywords: | geometrical frustration kagomé lattice spin-glass M?ssbauer spectroscopy |
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