Ferromagnetism in the Mott insulator Ba2NaOsO6 |
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| Authors: | Erickson A S Misra S Miller G J Gupta R R Schlesinger Z Harrison W A Kim J M Fisher I R |
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| Institution: | Department of Applied Physics and Geballe Laboratory for Advanced Materials, Stanford University, California 94305, USA. |
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| Abstract: | Results are presented of single crystal structural, thermodynamic, and reflectivity measurements of the double-perovskite Ba2NaOsO6. These characterize the material as a 5d1 ferromagnetic Mott insulator with an ordered moment of approximately 0.2microB 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 ground state 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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