Enhanced superconducting pairing interaction in indium-doped tin telluride
نویسندگان
چکیده
The ferroelectric degenerate semiconductor Sn1−δTe exhibits superconductivity with critical temperatures, Tc, of up to 0.3 K for hole densities of order 10 21 cm. When doped on the tin site with greater than xc = 1.7(3)% indium atoms, however, superconductivity is observed up to 2 K, though the carrier density does not change significantly. We present specific heat data showing that a stronger pairing interaction is present for x > xc than for x < xc. By examining the effect of In dopant atoms on both Tc and the temperature of the ferroelectric structural phase transition, TSPT , we show that phonon modes related to this transition are not responsible for this Tc enhancement, and discuss a plausible candidate based on the unique properties of the indium impurities.
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