Thermodynamic Properties of Ferromagnetic Mott- Insulators GaV4S8

C. S. Yadav; A. K. Nigam; A. K. Rastogi

doi:10.1016/j.physb.2007.10.172

Thermodynamic Properties of Ferromagnetic Mott- Insulators GaV4S8

Strongly Correlated Electrons 2009-11-13 v1 Materials Science

Authors: C. S. Yadav , A. K. Nigam , A. K. Rastogi

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Abstract

We present the results of the magnetic and specific heat measurements on V4 tetrahedral-cluster compound GaV4S8 between 2 to 300K. We find two transitions related to a structural change at 42K followed by ferromagnetic order at 12K on cooling. Remarkably similar properties were previously reported for the cluster compounds of Mo4. These compounds show an extremely high density of low energy excitations in their electronic properties. We explain this behavior in a cluster compound as due to the reduction of coulomb repulsion among electrons that occupy highly degenerate orbits of different clusters.

Keywords

ferromagnetic Mott insulator GaV4S8 V4 tetrahedral cluster specific heat magnetic transition low-energy excitations Coulomb repulsion

Cite

@article{arxiv.0706.0265,
  title  = {Thermodynamic Properties of Ferromagnetic Mott- Insulators GaV4S8},
  author = {C. S. Yadav and A. K. Nigam and A. K. Rastogi},
  journal= {arXiv preprint arXiv:0706.0265},
  year   = {2009}
}

Comments

To be publish in Physica B

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