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Pseudo-gap and possible Spin-Peierls transition in the vanadium oxide VOSb 2 O 4 |
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| Authors: | VA Pashchenko A Sulpice F Mila P Millet A Stepanov P Wyder |
| Institution: | (1) Grenoble High Magnetic Field Laboratory, MPI-FKF and CNRS, BP 166, 38042 Grenoble Cedex 9, France, FR;(2) B.Verkin Institute for Low Temperature Physics and Engineering, NASU, 310164 Kharkov, Ukraine, UA;(3) Centre de Recherches sur les Très Basses Températures, CNRS, BP 166, 38042 Grenoble Cedex 9, France, FR;(4) Institut de Physique Théorique, Université de Lausanne, 1015 Lausanne, Switzerland, CH;(5) Centre d'élaboration des Matériaux et d'études Structurales, CNRS, BP 4347, 31055 Toulouse Cedex 4, France, FR;(6) Laboratoire Matériaux et Microélectronique de Provence, Université d'Aix-Marseille III and CNRS, C-151, 13397 Marseille Cedex 20, France, FR |
| Abstract: | 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. Received 7 February 2001 and Received in final form 24 April 2001 |
| Keywords: | 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 |
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