Abstract
AC susceptibilities and DC magnetizations of Hg (1− x) Pb x Ba 2Ca 2Cu 3O y ( x=0.1 denoted as Hg-01 and x=0.2 as Hg-02) synthesized directly from the metal oxides were measured using a SQUID magnetometer and a PPMS susceptometer. The superconducting volume fractions were estimated from the temperature dependence of Meissner magnetization. Pb substitution of Hg site showed to enhance the volume fraction without sacrificing the critical temperatures of 134 K in both samples. Critical current densities J c were estimated from the magnetization width. Pinning potentials U p were evaluated from the relaxation rate of magnetic flux creep characteristics by using the Anderson–Kim model. Both samples show rapid decreases of the J c at high temperature. Hg-01 sample showed slightly higher J c and U p. Second peaks χ ″ p2 in the imaginary part of the AC susceptibilities χ″ appeared at low magnetic fields in both samples. The peak χ ″ p2 of Hg-01 disappears gradually at high magnetic field and the χ ″ p2 of Hg-02 sample dominates at low temperatures. Dependence of the χ ″ p2 on the temperature, DC magnetic field and AC field is extensively examined. Grain characteristics in HgPb1223 ceramic superconductors are discussed by taking into account of weak-coupling effect between grains and existence of second phases in both samples.
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