Open AccessSTUDIES OF FLUX CREEP IN Y0.9Eu0.1Ba2Cu3O7-δ
Author(s) -
蔡盟,
方明虎,
张宣嘉,
焦正宽,
张其瑞,
容锡燊,
赵柏儒
Publication year - 1994
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.43.1517
Subject(s) - creep , hysteresis , condensed matter physics , flux (metallurgy) , work (physics) , materials science , flux pinning , relaxation (psychology) , magnetic flux , critical current , magnetic field , physics , thermodynamics , superconductivity , composite material , psychology , social psychology , quantum mechanics , metallurgy
The magnetic hysteresis and relaxation behaviors in 237-δ and 0.90.1237-δ samples were measured in the wide ranges of temperature (4.2-80K) and field (0-8 T). The M(t), Jc(T) and Ueff(J) relationships in these samples were studied and several theoretical models were tested. The results show:(1)Both the effective pinning energy and critical current density in the absence of flux creep are obviously higher in 0.90.1237-δ than in 237-δ sample, which indicates the introductions of new pinning centers with larger pinning energy by the partial substitution of Eu for Y. (2) Compared with other models, the collective flux creep theory gives the best description on our experimental results and thus this work provides a new experimental evidence for this theory.