Thermally Activated Flux Motion in 2223 Phase High Temperature Superconductors

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

Cite this article:

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 Bi_1.8Pb_0.2Sr₂Ca₂Cu₃O_y high temperature superconductors (HTSCs) have been systematically studied. Below the irre-versibility temperature T_r(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/T_r(H))^-2v with v about 0.5. This behavior supports the existence of a two-dimensional secondary phase transition below H_c2(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
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	FENG Qingrong
	ZHANG Han
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	ZHU Xing
	YIN Daole

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