Phenomenological model of elastic distortions near the spin-Peierls transition in $CuGeO_3$

Details Phenomenological model of elastic distortions near the spin-Peierls transition in $CuGeO_3$ Phenomenological model of elastic distortions near the spin-Peierls transition in $CuGeO_3$

1995-08-17

arxiv.org/abs/cond-mat/9508067v1

Physics

Condensed Matter

1 figure available upon request

Scientific paper

10.1103/PhysRevB.53.594

A phenomenological model of the Landau type forms the basis for a study of elastic distortions near the spin-Peierls transition $T_c$ in $CuGeO_3$. 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.

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