Violation of the T−1 Relationship in the Lattice Thermal Conductivity of Mg3Sb2 with Locally Asymmetric Vibrations
(a) The crystal structure of Mg3Sb2 (generally expressed as MgMg2Sb2) with space group . (b) The theoretical (solid symbols) and experimental (hollow symbols) temperature-dependent in Mg3Sb2. The black dashed line represents the typical relationship. The purple dashed line indicates the off-diagonal thermal conductivity for Mg3Sb2. The inset image is a Mg3Sb2 single crystal sample, grown by the self-flux method with Sb as flux. (c) Frequency-dependent in Mg3Sb2 at 300 K and 700 K.