Ferromagnetism in the Mott insulator Ba2NaOsO6
Ferromagnetism in the Mott insulator Ba2NaOsO6
复制标题
DOI：
10.1103/physrevlett.99.016404
复制
发表时间：
2007-07-06
影响因子：
8.6
通讯作者：
Fisher, I. R.
中科院分区：
文献类型：
--
作者：
Erickson, A. S.;Misra, S.;Fisher, I. R.
给出了双钙钛矿型Ba2NaOsO6的单晶结构、热力学和反射率的测量结果。这表明该材料是一种5d(1)铁磁性Mott绝缘体，其有序矩类似于0.2mU(B)/公式单位，T-C=6.8(3)K。与这种相变相关的磁熵接近Rln2，表明从晶体结构考虑预期的四重态基态是分裂的，这与铁磁性与轨道有序性相关联的情况一致。
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.