Phenomenological model of elastic distortions near the spin-Peierls transition in $CuGe{O}_3$

Abstract

A phenomenological model of the Landau type forms the basis for a study of elastic distortions near the spin-Peierls transition $T_c$ in $CuGe{O}_3$. The atomic displacements proposed by Hirota {\it et al.} [Phys. Rev. Lett. {\bf 73}, 736 (1994)] are accounted for by the model which includes linear coupling between $Cu$ and $O$ distortions. $Cu$ displacements are seen to be responsible for anomalies in the elastic properties {\it at} $T_c$, whereas incipient $O$ distortions give rise to temperature dependence below $T_c$. A discussion of possible critical behavior is also made.

1 figure available upon request

References in corpus (1)

• Histogram Monte Carlo study of next-nearest-neighbor Ising antiferromagnet on a stacked triangular lattice