1999/09/24 by P. Millet, F. Mila, Frédéric Mila +10 · 2 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Organic and Molecular Conductors Research #Physics of Superconductivity and Magnetism #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.83.4176
4 pages including 3 figures, to appear in Phys. Rev. Lett
arxiv created 1999/09/24 · openalex publication_date 1999/11/15 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The magnetic susceptibility of a new one-dimensional S\phantom\rule0ex0ex=\phantom\rule0ex0ex1 system, the vanadium oxide LiVGe2O6, has been measured. Contrary to previous S\phantom\rule0ex0ex=\phantom\rule0ex0ex1 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.