Ferromagnetism in the Mott insulator Ba2NaOsO6

TitleFerromagnetism in the Mott insulator Ba2NaOsO6
Publication TypeJournal Article
Year of Publication2007
AuthorsErickson AS, Misra S, Miller GJ, Gupta RR, Schlesinger Z, Harrison WA, Kim JM, Fisher IR
Journal TitlePhysical Review Letters
Date PublishedJul
Type of ArticleArticle
ISBN Number0031-9007
Accession NumberISI:000247819900034
Keywordscrystal-growth, OSMIUM, PEROVSKITES

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 similar to 0.2 mu(B) per formula unit and T-C=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.

Alternate JournalPhys. Rev. Lett.