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Phonon chirality from impurity scattering in the antiferromagnetic phase of Sr2IrO4 - Nature Physics
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A thermal Hall effect occurs in an increasing number of insulators and is often attributed to phonons, but the underlying mechanism is not known in most cases. Two main scenarios have been proposed: either a coupling of phonons to spins or scattering of phonons by impurities or defects, but there is no systematic evidence to support either of them.
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