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We have investigated the Pb-substitution effect on the superconductivity ofNaCl-type In1-xPbxTe samples obtained using high-pressure synthesis.Polycrystalline samples with x = 0-0.8 were obtained, and the lattice parametersystematically increased by Pb substitution. The superconducting transitiontemperature (Tc ~3 K for x = 0) increased to 5.3 K (for x = 0.4) by Pbsubstitutions. According to the comparison of the electronic states betweenNaCl-type InTe and PbTe, we consider that the Pb substitution increaseselectron carriers. Possible mechanisms of the enhancement of Tc in this systemhave been discussed on the basis of conventional pairing mechanism and thepossibility of the relation to the valence-skipping state of In.

High-pressure synthesis and superconducting properties of NaCl-type In1-xPbxTe (x = 0-0.8)