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arXiv · 1311.2135

Novel magnetism of Ir5+ ions in the double perovskite Sr2YIrO6

G. Cao·T. F. Qi·L. Li·J. Terzic·S. J. Yuan·L. E. DeLong·G. Murthy·R. K. Kaul
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Abstract

We synthesize and study single crystals of a new double-perovskite Sr2YIrO6. Despite two strongly unfavorable conditions for magnetic order, namely, pentavalent Ir5+(5d4) ions which are anticipated to have Jeff=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 non-cubic crystal fields and intermediate-strength SOC. Sr2YIrO6 provides a rare example of the failed dominance of SOC in the iridates.

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G. Cao, T. F. Qi, L. Li, J. Terzic, S. J. Yuan, L. E. DeLong, G. Murthy, R. K. Kaul. 2013-11-09. Novel magnetism of Ir5+ ions in the double perovskite Sr2YIrO6. https://doi.org/10.1103/physrevlett.112.056402

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