https://doi.org/10.1007/PL00011124
Pseudo-gap and possible Spin-Peierls transition in the vanadium oxide VOSb2O4
1
Grenoble High Magnetic Field Laboratory, MPI-FKF and CNRS, BP 166, 38042 Grenoble Cedex 9, France
2
B.Verkin Institute for Low Temperature Physics and Engineering, NASU, 310164 Kharkov, Ukraine
3
Centre de Recherches sur les Très Basses Températures, CNRS, BP 166, 38042 Grenoble Cedex 9, France
4
Institut de Physique Théorique, Université de Lausanne, 1015 Lausanne, Switzerland
5
Centre d'Élaboration des Matériaux et d'Études Structurales, CNRS, BP 4347, 31055 Toulouse Cedex 4, France
6
Laboratoire Matériaux et Microélectronique de Provence, Université d'Aix-Marseille III and CNRS,
C-151,
13397 Marseille Cedex 20, France
Corresponding author: a stepanov@l2mp.u-3mrs.fr
Received:
7
February
2001
Revised:
24
April
2001
Published online: 15 June 2001
We report on the magnetic susceptibility and electron spin resonance measurements on polycrystalline samples of the vanadium oxide VOSb2O4, a quasi-one-dimensional S=1/2 Heisenberg system. The susceptibility vanishes at zero temperature, but there is no cusp at the onset of the susceptibility drop, and the ESR linewidth exhibits an increase characteristic of a phase transition at a much lower temperature. We show that this behaviour is consistent with the formation of a pseudo-gap in a spin-Peierls system in the adiabatic limit.
PACS: 75.45.+j – Macroscopic quantum phenomena in magnetic systems / 75.50.Ee – Antiferromagnetics / 75.40.Cx – Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.) / 76.30.-v – Electron paramagnetic resonance and relaxation
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001