In SrTiO3, the phonon thermal Hall signal is strong in clean crystals, weak in disordered ones, partially restored by air annealing without changing thermal conductivity, and identical with metallic or insulating contacts—so it is intrinsic and disorder/strain-sensitive.
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Phonon Thermal Hall Effect: The Roles of Disorder, Annealing, and Metallic Contacts
In SrTiO3, the phonon thermal Hall signal is strong in clean crystals, weak in disordered ones, partially restored by air annealing without changing thermal conductivity, and identical with metallic or insulating contacts—so it is intrinsic and disorder/strain-sensitive.