Etude de la structure magnetique et de la transition de typr “spin-flop” de Rb2FeF5 |
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Authors: | Alain Tressaud Jean Louis Soubeyroux Jean Michel Dance René Sabatier Paul Hagenmuller Barbara M. Wanklyn |
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Affiliation: | Laboratoire de Chimie du Solide du CNRS, Université de Bordeaux I 351, cours de la Libération, 33405 Talence Cedex, France.;Clarendon Laboratory, Oxford, OXI 3PU, Grande-Bretagne, England. |
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Abstract: | The nature of the magnetic interactions in the chain compound Rb2FeF5 has been investigated using neutron diffraction and magnetic measurements under high applied fields. Rb2FeF5 orders antiferromagnetically at TN = 8.0 ± 0.5 K; the magnetic structure is of the AZ + GX mode and the moment of the Fe3+ ion extrapoled to 0K is 3.5 ± 0.2 μB, this low value being due to zero-point spin reduction. Within a chain the Fe3+ ions are antiferromagnetically coupled with an exchange constant of J/k = ?8.8 K. A spin-flop behavior has been observed and interpreted on the basis of the molecular field theory. The critical field was found to be HC = 65 kOe at 1.7 K. |
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