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LOW-FIELD MICROWAVE SIGNAL IN UNDOPED AND Sb-DOPED Bi-Pb-Sr-Ca-Cu-O
HOU BI-HUI (侯碧辉), WANG MEI-SHENG (王梅生), CHEN ZHAO-JIA (陈兆甲), XU QIN-LUN (许勤论), JIN TONG-ZHENG (金通政)
Acta Physica Sinica (Overseas Edition), 1994, 3 (9):
708-711.
DOI: 10.1088/1004-423X/3/9/009
Non-resonant low-field microwave signal in undoped Bi-Pb-Sr-Ca-Cu-O (2223) sample inches monotonously with decreasing temperature, like that in many bulk samples of high-Tc superconductor. But the signed of a Sb-doped sample shows a peak at 103K, and declines gradually and tends to stabilize when the temperature is further reduced. A distorted 2223 phase (i.e., 130K phase) which was an intergrowth of 2223 and insulating monoclinic phases in the Sb-doped sample, was unstable, and it might change into the stable insulating monoclinic phase and lost its superconductivity at lower temperatures.
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