Journal
PHYSICAL REVIEW LETTERS
Volume 88, Issue 6, Pages -Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.88.067203
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We study the effects of magnetoelastic couplings on pyrochlore antiferromagnets, We employ Landau theory, extending an investigation begun by Yamashita and Ueda for the ease 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 Neel phases, with most simply collinear, but also coplanar or mixed spin patterns. In a collinear Neel phase, a dispersionless stringlike magnon mode dominates the resulting excitation spectrum, providing a distinctive signature of the parent geometrically frustrated state. We comment on the experimental situation.
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