Lattice Dimerization in the Spin-Peierls Compound CuGeO$_3$

Details Lattice Dimerization in the Spin-Peierls Compound CuGeO$_3$ Lattice Dimerization in the Spin-Peierls Compound CuGeO$_3$

1998-06-02

arxiv.org/abs/cond-mat/9806022v1

Physica B, 259-261, 956 (1999)

Physics

Condensed Matter

2 pages, 1 figure included

Scientific paper

10.1016/S0921-4526(98)00720-0

The uniaxial pressure dependences of the exchange coupling and the structural distortion in the dimerized phase of CuGeO$_3$ are analyzed. A minimum magnetic dimerization of 3 % is obtained, incompatible with an adiabatic approach to the spin-Peierls transition. Exploring the properties of an Heisenberg spin chain with dynamical spin-phonon coupling, the dimerization dependence of the spin excitation gap is found to be in qualitative agreement with experiment.

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