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

Authors

Gang Cao, University of KentuckyFollow
Tongfei Qi, University of KentuckyFollow
Li Li, University of KentuckyFollow
Jsaminka Terzic, University of KentuckyFollow
Shujuan Yuan, University of KentuckyFollow
Lance E. De Long, University of KentuckyFollow
Ganpathy Murthy, University of KentuckyFollow
Ribhu K. Kaul, University of KentuckyFollow

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 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.

Document Type

Article

Publication Date

2-2014

Notes/Citation Information

Published in Physical Review Letters, v. 112, no. 5, 056402.

© 2014 American Physical Society.

The copyright holder has granted the permission for posting the article here.

Digital Object Identifier (DOI)

http://dx.doi.org/10.1103/PhysRevLett.112.056402

Repository Citation

Cao, Gang; Qi, Tongfei; Li, Li; Terzic, Jsaminka; Yuan, Shujuan; De Long, Lance E.; Murthy, Ganpathy; and Kaul, Ribhu K., "Novel Magnetism of Ir⁵⁺(5d⁴) Ions in the Double Perovskite Sr₂YIrO₆" (2014). Physics and Astronomy Faculty Publications. 3.
https://uknowledge.uky.edu/physastron_facpub/3