Single crystal growth and magnetism of Sr3NaIrO6 and Sr3AgIr O6: Tracking the 
J=0 ground state of Ir5+

Song, Peng-Bo; Hu, Zhiwei; Hsu, Su-Yang; Chen, Jin-Ming; Lee, Jyh-Fu; Miao, Shan-Shan; Shi, You-Guo; Feng, Hai L.

doi:10.1103/PhysRevMaterials.6.094415

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Single crystal growth and magnetism of Sr₃NaIrO₆ and Sr₃AgIr O₆: Tracking the J=0 ground state of Ir⁵⁺

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Hu, Zhiwei
Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Song, P.-B., Hu, Z., Hsu, S.-Y., Chen, J.-M., Lee, J.-F., Miao, S.-S., et al. (2022). Single crystal growth and magnetism of Sr₃NaIrO₆ and Sr₃AgIr O₆: Tracking the J=0 ground state of Ir⁵⁺. Physical Review Materials, (9): 094415, pp. 1-8. doi:10.1103/PhysRevMaterials.6.094415.

Cite as: https://hdl.handle.net/21.11116/0000-000B-6123-0

Abstract

Single crystals of Sr3NaIrO6 and Sr3AgIrO6 have been successfully grown using hydroxides flux. Sr3NaIrO6 and Sr3AgIrO6 crystallize in the K4CdCl6-type structure with the space group R-3c (no. 167). Sr3NaIrO6 and Sr3AgIrO6 are electrically insulating with estimated activation gaps of 0.68 and 0.80 eV, respectively. Sr3NaIrO6 and Sr3AgIrO6 show paramagnetic behavior down to 2 K. In this work, the observed effective moments, μeff, for Sr3NaIrO6 single crystals are 0.31μB for H⊥c and 0.28μB for H||c, which are much smaller than that of 0.49μB previously reported for the polycrystalline Sr3NaIrO6 samples. For Sr3AgIrO6 single crystals, a much larger value of μeff=0.57μB is observed as compared with Sr3NaIrO6 single crystals. The x-ray absorption spectroscopy and low-temperature specific heat data indicate that the Ir in Sr3NaIrO6 has an almost pure Ir5+ valence state, while the Ir in Sr3AgIrO6 is slightly lower than +5. The estimated low limits of magnetic impurity Ir4+ are about ∼1.7% and ∼9.2% for Sr3NaIrO6 and Sr3AgIrO6, respectively. These magnetic impurities are likely to fully explain the observed μeff values for Sr3NaIrO6 and Sr3AgIrO6 single crystals, supporting the J=0 ground state of Ir5+ in Sr3NaIrO6 and Sr3AgIrO6. © 2022 American Physical Society.