A 'heavy-light, soft-stiff' crystal motif is proposed and screened to simultaneously suppress particle-like and wave-like phonon heat transport, predicting ultralow thermal conductivity in Tl4SiS4 and Tl4GeS4.
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Cooperative Suppression Strategy for Dual Thermal Transport Channels in Crystalline Materials
A 'heavy-light, soft-stiff' crystal motif is proposed and screened to simultaneously suppress particle-like and wave-like phonon heat transport, predicting ultralow thermal conductivity in Tl4SiS4 and Tl4GeS4.