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Biquadratic interactions and spin-Peierls transition in the spin 1 chain LiVGe2O6

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arxiv cond-mat/9909357 v1 pith:EOK7W6CX submitted 1999-09-24 cond-mat.str-el

P. Millet , F. Mila , F. C. Zhang , M. Mambrini , A. B. Van Oosten , V. A. Pashchenko , A. Sulpice , A. Stepanov This is my paper · ORCID
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keywords biquadraticlivge2o6spin-peierlstransitionaboveabruptaccountbeen
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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 behaviour is due to the presence of a significant biquadratic exchange interaction, a suggestion supported by quantum chemistry calculations that take into account the quasi-degeneracy of the t2g levels.

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