Order by distortion and string modes in pyrochlore antiferromagnets.
作者： Oleg Tchernyshyov , R. Moessner , S. L. Sondhi
DOI: 10.1103/PHYSREVLETT.88.067203
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摘要: We study the effects of magnetoelastic couplings on pyrochlore antiferromagnets. We employ Landau theory, extending an investigation begun by Yamashita and Ueda for the case of S= 1, and classical analyses to argue that such couplings generate bond order via a spin-Peierls transition. This is followed by, or concurrent with, a transition into one of several possible low-temperature Néel phases, with most simply collinear, but also coplanar or mixed spin patterns. In a collinear Néel phase, a dispersionless stringlike magnon mode …
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