LOW-FIELD MICROWAVE SIGNAL IN UNDOPED AND Sb-DOPED Bi-Pb-Sr-Ca-Cu-O
HOU BI-HUI (侯碧辉)a, WANG MEI-SHENG (王梅生)a, CHEN ZHAO-JIA (陈兆甲)a, XU QIN-LUN (许勤论)b, JIN TONG-ZHENG (金通政)c
a Laboratory of Structure Analysis, Department of Physics, University of Science and Technology of China, Hefei 230026, China; b Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China; c Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210008, China
Abstract 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.
Received: 26 July 1993
Revised: 12 January 1994
Accepted manuscript online:
The microwave response of MgB2/Al2O3 superconducting thin films Shi Li-Bin(史力斌), Wang Yun-Fei(王云飞), Ke Yu-Yang(柯于洋), Zhang Guo-Hua(张国华), Luo Sheng(罗胜), Zhang Xue-Qiang(张雪强), Li Chun-Guang(李春光), Li Hong(黎红), He Yu-Sheng(何豫生), Yu Zeng-Qiang(于增强), and Wang Fu-Ren(王福仁). Chin. Phys. B, 2007, 16(3): 799-804.
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