Ga substitution induces symmetry-allowed optical-optical avoided crossings in TlIn0.5Ga0.5Te2 that suppress optical phonon group velocities, cutting their contribution to κ_l from 63% to 44% and lowering overall κ_l at 300 K.
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Strong Optical-Optical Avoided Crossings Suppress Thermal Conductivity in Ga-Substituted TlInTe$_2$
Ga substitution induces symmetry-allowed optical-optical avoided crossings in TlIn0.5Ga0.5Te2 that suppress optical phonon group velocities, cutting their contribution to κ_l from 63% to 44% and lowering overall κ_l at 300 K.