Electronic transport and thermoelectricity in selenospinel Cu$_{6-x}$Fe$_{4+x}$Sn$_{12}$Se$_{32}$

We report a study of selenospinel Cu $_{6 - x}$ Fe $_{4 + x}$ Sn $_{12}$ Se $_{32}$ ( $x$ = 0, 1, 2) single crystals, which crystalize in a cubic structure with the $F d \overline{3} m$ space group, and show typical semiconducting behavior. The large discrepancy between the activation energy for electrical conductivity $E_{ρ}$ (32.3 $\sim$ 69.8 meV), and for thermopower $E_{S}$ (3.2 $\sim$ 11.5 meV), indicates a polaronic transport mechanism between 350 and 50 K. With decreasing temperature, it evolves into variable-range hopping conduction. Furthermore, the heat capacity shows a hump around 25(5) K and diverges from the Debye $T^{3}$ law at low temperatures, indicating the observation of structural glassy features in these crystalline solids.

Electronic transport and thermoelectricity in selenospinel Cu $_{6 - x}$ Fe $_{4 + x}$ Sn $_{12}$ Se $_{32}$

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Electronic transport and thermoelectricity in selenospinel Cu $_{6 - x}$ Fe $_{4 + x}$ Sn $_{12}$ Se $_{32}$

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Electronic transport and thermoelectricity in selenospinel Cu6−x6−x​Fe4+x4+x​Sn1212​Se3232​

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Electronic transport and thermoelectricity in selenospinel Cu6−x6−x​Fe4+x4+x​Sn1212​Se3232​

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Electronic transport and thermoelectricity in selenospinel Cu $_{6 - x}$ Fe $_{4 + x}$ Sn $_{12}$ Se $_{32}$

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Electronic transport and thermoelectricity in selenospinel Cu $_{6 - x}$ Fe $_{4 + x}$ Sn $_{12}$ Se $_{32}$

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