Open AccessFLUX MOTION AND CRITICAL CURRENT CHARACTERISTICS OF Ag-SHEATHED Bi1.8Pb0.4Sr2Ca2.2Cu3Oy TAPES
Author(s) -
Zhaoyang Zeng,
Shi Ke-Xin,
Yu Zheng,
Ding Shiying,
Zhou Yi-Ru,
Bing Ye
Publication year - 1993
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.42.1160
Subject(s) - condensed matter physics , activation energy , nucleation , arrhenius equation , superconductivity , flux (metallurgy) , materials science , flux pinning , magnetic field , magnetic flux , vortex , current (fluid) , field (mathematics) , critical current , physics , thermodynamics , chemistry , organic chemistry , mathematics , quantum mechanics , pure mathematics , metallurgy
Ag-sheathed Bi1.8Pb0.4Sr2Ca2.2Cu3Oy superconducting tapes were prepared. Microstruc-ture examination shows that it were made of highly textured Bi2223 single phase. Measurements of transport properties in liquid nitrogen and field lower than 1T reveal that Jc(T,B,θ, φ) and R(T,B,θ,φ) of this material are θ dependent and φ independent, where θ is the angle between magnetic field and ab plane and φ is the angle between magnetic field and transport current. Activation energy of flux lines was gained. The Arrhenius relation of R(T,B) was observed and activation energy of flux motion was determined. The transport characteristics and the activation energy are explained as the thermally activated flux line diffusive motion over intrinsic flux pinning barrier by means of nucleation of two-dimensional pancake vortex pairs.