September 29, 2025Open Access

Spin-lattice coupling and lattice anharmonicity across structural phase transitions in spin-orbit coupled K2IrBr6

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Discussion

Analyzing spin-lattice interactions and phonon behavior during structural phase transitions in K2IrBr6, implying strong SOC effects.

Persistent spin-spin correlations emerge above the Nél temperature of 12 K, indicating strong interactions.
EPR findings show exchange narrowing and anisotropic g-factors, emphasizing the impact of spin-orbit coupling.
Raman scattering identifies phonon anomalies at transition temperatures, revealing increasing lattice anharmonicity.
The systematic enhancement of anharmonic effects suggests evolving spin correlations contribute to phonon renormalization.

Bhatia et al. (2025) studied this question.

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