Spin-Peierls transition with strong structural fluctuations in the vanadium oxide VOSb${}_2$O${}_4$

Abstract

We report on the magnetic susceptibility and electron spin resonance measurements on polycrystalline samples of the vanadium oxide VOSb${}_2$O${}_4$, a quasi-one dimensional S=1/2 Heisenberg system. We show that the susceptibility vanishes at zero temperature, as in a gapped system, and we argue that this is due to a spin-Peierls transition with strong structural fluctuations.

5 pages, 4 figures