Chin. Phys. Lett.  1992, Vol. 9 Issue (4): 206-208    DOI:
Original Articles |
Thermally Activated Flux Motion in 2223 Phase High Temperature Superconductors
CHEN Jun;LI Gang;LI Chuanyi;FENG Qingrong;ZHANG Han;FENG Xiaoqi;ZHU Xing;YIN Daole
Department of Physics, Peking University, Beijing 100871
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CHEN Jun, LI Gang, LI Chuanyi et al  1992 Chin. Phys. Lett. 9 206-208
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Abstract Isothermal V-I characteristics of Bi1.8Pb0.2Sr2Ca2Cu3Oy high temperature superconductors (HTSCs) have been systematically studied. Below the irre-versibility temperature Tr(H), two important features were observed: 1) Both positive and negative curvatures can coexist in the same isothermal V-I curve, so it is different from the scaling behavior V∝exp(-(J0/J)μ). 2) The activa-ion volume of flux motion is found temperature dependent as (1=T/Tr(H))-2v with v about 0.5. This behavior supports the existence of a two-dimensional secondary phase transition below Hc2(T) in this Bi-based HTSCs.

Keywords: 74.60.Ec      74.60.Ge     
Published: 01 April 1992
PACS:  74.60.Ec  
  74.60.Ge  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y1992/V9/I4/0206
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CHEN Jun
LI Gang
LI Chuanyi
FENG Qingrong
ZHANG Han
FENG Xiaoqi
ZHU Xing
YIN Daole
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