Biquadratic Interactions and Spin-Peierls Transition in the Spin-1 Chain LiVGe2O6
- Millet, P.
- Mila, Frédéric
- C. Zhang, F.
- Mambrini, Matthieu
- B. van Oosten, A.
- A. Pashchenko, V.
- Sulpice, André
- Stepanov, A.,
Publication date
January 1999
DOI Publisher
American Physical Society (APS)Abstract
The magnetic susceptibility of a new one-dimensional S=1 system, the vanadium oxide LiVGe2O6, has been measured. Contrary to previous S=1 chains, it exhibits an abrupt drop at 22 K typical of a spin-Peierls transition, and it is consistent with a gapless spectrum above this temperature. We propose that this behavior is due to the presence of a significant biquadratic exchange interaction, a suggestion supported by quantum chemistry calculations that take into account the quasidegeneracy of the t2g levels
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