  High-entropy-alloy-type tellurides M-Te, which contain five different metals
of M = Ag, In, Cd, Sn, Sb, Pb, and Bi, were synthesized using high pressure
synthesis. Structural characterization revealed that all the obtained samples
have a cubic NaCl-type structure. Six samples, namely AgCdSnSbPbTe5,
AgInSnSbPbTe5, AgCdInSnSbTe5, AgCdSnPbBiTe5, AgCdInPbBiTe5, and AgCdInSnBiTe5
showed superconductivity. The highest transition temperature (Tc) among those
samples was 1.4 K for AgInSnSbPbTe5. A sample of AgCdInSbPbTe5 showed a
semiconductor-like transport behavior. From the relationship between Tc and
lattice constant, it was found that a higher Tc is observed for a telluride
with a larger lattice constant.
