Dynamic spin-glass behavior in a disorder-free,two-component model of quantum frustrated magnets |
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Authors: | F Mila D Dean |
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Institution: | (1) Institut de Physique Théorique, Université de Lausanne, 1015 Lausanne, Switzerland, CH;(2) Laboratoire de Physique Quantique, Université Paul Sabatier, 31062 Toulouse, France, FR |
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Abstract: | Motivated by the observation of a spin-glass transition in almost disorder-free Kagome antiferromagnets, and by the specific
form of the effective low-energy model of the S = 1/2, trimerized Kagome antiferromagnet, we investigate the possibility to obtain a spin-glass behavior in two-component,
disorder-free models. We concentrate on a toy-model, a modified Ashkin-Teller model in a magnetic field that couples only
to one species of spins, for which we prove that a dynamic spin-glass behavior occurs. The dynamics of the magnetization is
closely related to that of the underlying Ising model in zero field in which spins and pseudo-spins are intimately coupled.
The spin-glass like history dependence of the magnetization is a consequence of the ageing of the underlying Ising model.
Received 21 September 2001 and Received in final form 16 January 2002 |
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Keywords: | PACS 75 10 Jm Quantized spin models – 75 10 Nr Spin-glass and other random models – 75 50 Lk Spin glasses and other random magnets |
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