Orbitally Driven Spin Pairing in the 3D Non-Magnetic Mott Insulator BaVS3: Evidence from Single Crystal Studies
Abstract
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 quasi-doublet. The disordered insulator at TX<T<TMI is described as a classical liquid of non-magnetic pairs.
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