Discovery of multivalley Fermi surface responsible for the high thermoelectric performance in Yb₁₄MnSb₁₁ and Yb₁₄MgSb₁₁.

This would imply that the increase must come from the electronic portion of thermal conductivity; yet, an estimation of the electronic thermal conductivity results in a decreasing trend with increasing temperature ( 3 , 26 , 27 , 30 ).

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