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Intrinsically low lattice thermal conductivity (κlat) while maintaining the high carrier mobility (μ) is of the utmost importance for thermoelectrics. Topological insulators (TI) can possess high μ due to the metallic surface states. TIs with heavy constituents and layered structure can give rise to high anharmonicity and are expected to show low κlat. Here, we demonstrate that Bi1.1Sb0.9Te2S (BSTS),...
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