Order by distortion and string modes in pyrochlore antiferromagnet

Details Order by distortion and string modes in pyrochlore antiferromagnet Order by distortion and string modes in pyrochlore antiferromagnet

2001-08-29

arxiv.org/abs/cond-mat/0108505v1

Phys. Rev. Lett. 88, 067203 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 inline figures

Scientific paper

10.1103/PhysRevLett.88.067203

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 semiclassical 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 string-like 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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