The Fabrication and Characterization of Superconducting Tl_<0.5>Pb_<0.5>(Ca_<1-x>M_x)Sr_2Cu_2O_y Compounds with M=Mischmetal

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Bulk superconductivity with T_c(zero) up to 101 K in Tl_<0.5>Pb_<0.5>(Ca_<1-x>M_x)Sr_2Cu_2O_y system with M=mischmetal and x=0, 0.05, 0.1, 0.2, and 0.3 was observed. The powder X-ray diffraction profiles indicate a single phase, P4/mmm tetragonal crystal structure with a=3.80±0.02 Å and c=12.05±0.02 Å for Tl_<0.5>Pb_<0.5>(Ca_<1-x>M_x)Sr_2Cu_2O_y compounds. T_c(zero)'s were found to be 78, 91, 101, 98, and 87 K for x=0, 0.05, 0.1, 0.2 and 0.3 respectively. The sample of Tl_<0.5>Pb_<0.5>(Ca_<0.9>M_<0.1>)Sr_2Cu_2O_y was found to be the most homogeneous both in composition and structure. Meissner signal of this sample indicates the T_c onset around 100 K and mass diamagnetic susceptibility -χ_g at 10 K is 1.3 × 10^<-3> emu/g・G (field-cooled at 100 G).
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1989-07-20