We have investigated superconductivity and structure in a gold-antimony-tellurium ternary alloy system (Au x Sb 1−x−y Te y ) synthesized under high pressure. We found that Au 0.125 Sb 0.75 Te 0.125 and AuSb 6 Te when crystallized in simple cubic structures (α-Po type), which are reported to be semiconductors above 20 K, are superconductors with a transition temperature (T c ) of 6.7 K. The structure and T c are mapped on an Au-Sb-Te triangular diagram. A β-Po-type rhombohedral structure appears before the crystal structure changes from As type (Sb) to α-Po type. Superconductivity is observed in the β-Po-type structure as well as in the α-Po-type structure. T c increases with decreasing Te concentration toward the Te-free Au-Sb end of the diagram. A T c of 8.1 K was achieved for the Au-Sb alloy with a typical composition of Au 0.15 Sb 0.85 . This T c value is the highest among materials with the α-Po-type structure under ambient pressure. Our Au 0.125 Sb 0.75 Te 0.125 sample exhibits a weak metallic behavior in resistivity. The discrepancy in the normal state resistivity behaviors between the previous study and ours must originate from a difference in the number of lattice defects in the samples.
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