Flux Creep Determination of Field Dependence of Magnetic Jc at Low Temperatures
RUI Ying1,2, JI Helin1,2, XU Xiaonong1, QIN Mengjun1, SHAO Huimin1, JIN Xin, YAO Xixian1
1Department of Physics, and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210008
2National Laboratory for Superconductivity, Institute of Physics, Academia Sinica, Beijing 100080
Flux Creep Determination of Field Dependence of Magnetic Jc at Low Temperatures
1Department of Physics, and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210008
2National Laboratory for Superconductivity, Institute of Physics, Academia Sinica, Beijing 100080
Abstract： The effective activation energy of one HgBaCaCuO 1223 superconductor as a function of current density was extracted from the magnetic relaxation measurements below 30K, and found to obey a power law. We also obtained effective activation energy as a function of current density from the magnetic hysteresis loops (M-H). The data sets for the M-H loops at different temperatures overlap each other, and all fall on the smooth Ueff( J,0 ) curve based solely on the magnetization relaxation measurements. This indicates that the field dependence of magnetic critical current density is determined by the flux creep via nonlinear effective activation energy at low temperatures.
RUI Ying;JI Helin;XU Xiaonong;QIN Mengjun;SHAO Huimin;JIN Xin;YAO Xixian. Flux Creep Determination of Field Dependence of Magnetic Jc at Low Temperatures[J]. 中国物理快报, 1995, 12(4): 233-236.
RUI Ying, JI Helin, XU Xiaonong, QIN Mengjun, SHAO Huimin, JIN Xin, YAO Xixian. Flux Creep Determination of Field Dependence of Magnetic Jc at Low Temperatures. Chin. Phys. Lett., 1995, 12(4): 233-236.
1995, Vol. 12 
