Phase diagram of PbBi alloys: structure-property relations and the superconducting coupling

We report on the crystal structure transformation and superconducting phase diagrams for a Pb _m Bi_100−m (0 <  m  < 100 in %) alloy. The superconducting coupling strength is resolved by analyzing the dependency of T _C on the applied magnetic field. The phase diagram shows evidence for strong-coupling s -wave superconductivity for all alloys of Pb _m Bi_100−m and the dependency of the superconducting parameters on the weight percent of each constituent phase is discussed in the phase diagram. Very strong coupling of 2Δ_o/ k _B T _C ∼ 5.174 is observed in the present Pb _m Bi_100−m phase diagram. (paper)