Ferromagnetism in the Mott insulator Ba2NaOsO6
A. S. Erickson, S. Misra, G. J. Miller, R. R. Gupta, Z. Schlesinger,, W. A. Harrison, J. M. Kim, I. R. Fisher
TL;DR
This paper reports the discovery of ferromagnetism in Ba2NaOsO6, a 5d^1 Mott insulator, characterized by structural, thermodynamic, and reflectivity measurements revealing its magnetic and orbital properties.
Contribution
It provides the first detailed characterization of ferromagnetism and orbital ordering in Ba2NaOsO6, a 5d^1 Mott insulator, using multiple experimental techniques.
Findings
Ferromagnetic transition at TC = 6.8 K
Ordered magnetic moment of ~0.2 Bohr magnetons
Magnetic entropy close to Rln2 indicating orbital effects
Abstract
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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