Novel Magnetism of Ir5+(5d4) ions in the Double Perovskite Sr2YIrO6

被引:161
作者
Cao, G. [1 ,2 ]
Qi, T. F. [1 ,2 ]
Li, L. [1 ,2 ]
Terzic, J. [1 ,2 ]
Yuan, S. J. [1 ,2 ,3 ]
DeLong, L. E. [1 ,2 ]
Murthy, G. [1 ,2 ]
Kaul, R. K. [1 ,2 ]
机构
[1] Univ Kentucky, Dept Phys & Astron, Lexington, KY 40506 USA
[2] Univ Kentucky, Ctr Adv Mat, Lexington, KY 40506 USA
[3] Shanghai Univ, Dept Phys, Shanghai, Peoples R China
基金
美国国家科学基金会;
关键词
Double perovskites - Face centered cubic structure - Geometric frustration - Magnetic orders - Magnetic transitions - Non-cubic crystals - Singlet ground state;
D O I
10.1103/PhysRevLett.112.056402
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We synthesize and study single crystals of a new double-perovskite Sr2YIrO6. Despite two strongly unfavorable conditions for magnetic order, namely, pentavalent Ir5+ (5d(4)) ions which are anticipated to have J(eff) = 0 singlet ground states in the strong spin-orbit coupling (SOC) limit and geometric frustration in a face-centered cubic structure formed by the Ir5+ ions, we observe this iridate to undergo a novel magnetic transition at temperatures below 1.3 K. We provide compelling experimental and theoretical evidence that the origin of magnetism is in an unusual interplay between strong noncubic crystal fields, local exchange interactions, and "intermediate-strength- SOC. Sr2YIrO6 provides a rare example of the failed dominance of SOC in the iridates.
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页数:5
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