Ferromagnetism in the Mott insulator Ba2NaOsO6

Details Ferromagnetism in the Mott insulator Ba2NaOsO6 Ferromagnetism in the Mott insulator Ba2NaOsO6

2006-10-13

arxiv.org/abs/cond-mat/0610385v2

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures, added references

Scientific paper

10.1103/PhysRevLett.99.016404

Results are presented of single crystal structural, thermodynamic, and reflectivity measurements of the double-perovskite Ba2NaOsO6. These characterize the material as a 5d^1 ferromagnetic Mott insulator with an ordered moment of ~0.2 Bohr magnetons per formula unit and TC = 6.8(3) K. The magnetic entropy associated with this phase transition is close to Rln2, indicating that the quartet groundstate anticipated from consideration of the crystal structure is split, consistent with a scenario in which the ferromagnetism is associated with orbital ordering.

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