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Phys. Rev. B 61, R7831–R7834 (2000)

Orbitally driven spin pairing in the three-dimensional nonmagnetic Mott insulator BaVS3: Evidence from single-crystal studies

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G. Mihály
Institut de Géniue Atomique, Ecole Politechnique Federale de Lausanne, CH-1015 Lausanne, Switzerland
Department of Physics, Technical University of Budapest, H-1111 Budapest, Hungary

I. Kézsmárki and F. Zámborszky
Department of Physics, Technical University of Budapest, H-1111 Budapest, Hungary

M. Miljak
Institute of Physics of the University, P.O. Box 304, Zagreb, Croatia

K. Penc
Service de Physique Théorique, C.E.A. Saclay, 91191 Gif-sur Yvette Cedex, France
Research Institute for Solid State Physics and Optics, H-1525 Budapest, P.O.B. 49, Hungary

P. Fazekas
Department of Theoretical Physics, Technical University of Budapest, H-1111 Budapest, Hungary
Research Institute for Solid State Physics and Optics, H-1525 Budapest, P.O.B. 49, Hungary

H. Berger and L. Forró
Institut de Géniue Atomique, Ecole Politechnique Federale de Lausanne, CH-1015 Lausanne, Switzerland

Received 25 January 2000; published in the issue dated 15 March 2000

Static electrical and magnetic properties of single crystal BaVS3 were measured over the structural (TS=240K), metal insulator (TMI=69K), and suspected orbital ordering (TX=30K) transitions. The resistivity is almost isotropic both in the metallic and insulating states. An anomaly in the magnetic anisotropy at TX signals a phase transition to an ordered low-T state. The results are interpreted in terms of orbital ordering and spin pairing within the lowest crystal-field quasidoublet. The disordered insulator at TX<T<TMI is described as a classical liquid of nonmagnetic pairs.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.61.R7831
DOI:
10.1103/PhysRevB.61.R7831
PACS:
71.27.+a, 71.30.+h, 72.80.Ga, 75.10.Dg
 
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