Antiferromagnetic resonance in the cubic iridium hexahalides (NH4)2IrCl6 and K2IrCl6
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Contributors
Abstract
We report on high-field electron spin resonance studies of two iridium hexahalide compounds (NH4)2IrCl6 and K2IrCl6. In the paramagnetic state, our measurements reveal isotropic g factors g=1.79(1) for the Ir4+ ions, in agreement with their cubic symmetries. Most importantly, in the magnetically ordered state, we observe two magnon modes with zero-field gaps of 11.3 and 14.2 K for (NH4)2IrCl6 and K2IrCl6, respectively. Based on that and using linear spin-wave theory, we estimate the nearest-neighbor exchange couplings and anisotropic Kitaev interactions J1/kB=10.3K, K/kB=0.7K for (NH4)2IrCl6, and J1/kB=13.8K, K/kB=0.9K for K2IrCl6, revealing the nearest-neighbor Heisenberg coupling as the leading interaction term, with only a weak Kitaev anisotropy.
Details
Original language | English |
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Article number | 184404 |
Journal | Physical Review B |
Volume | 104 |
Issue number | 18 |
Publication status | Published - 1 Nov 2021 |
Peer-reviewed | Yes |