Spin-glass transition in bond-disordered heisenberg antiferromagnets coupled with local lattice distortions on a pyrochlore lattice

Hiroshi Shinaoka, Yusuke Tomita, Yukitoshi Motome

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32 Citations (Scopus)

Abstract

Motivated by puzzling characteristics of spin-glass transitions widely observed in pyrochlore-based frustrated materials, we investigate the effects of coupling to local lattice distortions in a bond-disordered antiferromagnet on the pyrochlore lattice by extensive Monte Carlo simulations. We show that the spin-glass transition temperature Tf is largely enhanced by the spin-lattice coupling and, furthermore, becomes almost independent of Δ in a wide range of the disorder strength Δ. The critical property of the spin-glass transition is indistinguishable from that of the canonical Heisenberg spin glass in the entire range of Δ. These peculiar behaviors are ascribed to a modification of the degenerate manifold from a continuous to semidiscrete one by spin-lattice coupling.

Original languageEnglish
Article number047204
JournalPhysical Review Letters
Volume107
Issue number4
DOIs
Publication statusPublished - 2011 Jul 20

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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