Open AccessCHARACTERISTICS OF PINNING FORCE IN LOW FIELD FOR Tl2Ba2Ca2Cu3Oy SUPERCONDUCTOR
Author(s) -
Ding Shiying,
Zhixiang Shi,
Tan Jia-Lie,
Yu Zheng,
Shi Ke-Xin,
Tong Hong-Wu,
Qiu Li
Publication year - 1990
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.39.1999
Subject(s) - pinning force , condensed matter physics , zener pinning , superconductivity , flux pinning , magnetization , hysteresis , materials science , field (mathematics) , crystallite , critical current , magnetic field , physics , quantum mechanics , mathematics , pure mathematics , metallurgy
By measuring magnetization curves of polycrystalline Tl2Ba2Ca2Cu3Oy superconductor, magnetitudes of the hysteresis against temperature T and applied field Ba have been obtained. Using the critical state equation, we have got an effective pinning force which varies with temperature and field and results from both contributions of winklinks and intragrain pinning. Peak effect of the effective pinning force has been found, and the peak moves to higher fields with temperature dropping. The peak effect is considered to be the results of two pinning mechanisms, which have different field relations. Finally, some discussions about the results are made.