TY - JOUR
T1 - Effect of Weak DC Magnetic Fields on the AC Magnetization of a Melt-Processed YBa2Cu3Oy
AU - Harashima, Ken Ichiro
AU - Tochihara, Shinjiro
AU - Yasuoka, Hiroshi
AU - Mazaki, Hiromasa
AU - Osada, Minoru
AU - Inoue, Atsuyoshi
AU - Kakihana, Masato
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1998/7
Y1 - 1998/7
N2 - We studied, both theoretically and experimentally, the ac magnetic response of type-II superconductors superimposed on a weak Hdc field. Theoretical simulations were made within the construct of the Kim-Anderson critical-state model, where the critical current density Jc is assumed to be given by Jc= k / (B0+|Bi|). k and B0 are temperature-dependent material parameters, and Bi is the local flux density in the sample. We also measured complex susceptibilities Xn=X′n-iX″n (n=1,2,3,5,7) of a melt-processed YBa2Cu3Oy specimen and analyzed the observed Xn by applying the magnetization equations derived from the Kim-Anderson model. We found that the experimental results were qualitatively well reproduced. Present results indicate that, for a specimen of which Jc sensitively varies with B1, the effect of a weak Hdc should be explicitly taken into consideration for studies of the ac magnetization.
AB - We studied, both theoretically and experimentally, the ac magnetic response of type-II superconductors superimposed on a weak Hdc field. Theoretical simulations were made within the construct of the Kim-Anderson critical-state model, where the critical current density Jc is assumed to be given by Jc= k / (B0+|Bi|). k and B0 are temperature-dependent material parameters, and Bi is the local flux density in the sample. We also measured complex susceptibilities Xn=X′n-iX″n (n=1,2,3,5,7) of a melt-processed YBa2Cu3Oy specimen and analyzed the observed Xn by applying the magnetization equations derived from the Kim-Anderson model. We found that the experimental results were qualitatively well reproduced. Present results indicate that, for a specimen of which Jc sensitively varies with B1, the effect of a weak Hdc should be explicitly taken into consideration for studies of the ac magnetization.
KW - Complex susceptibility
KW - Critical-state model
KW - Melt-processed YBaCuO
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U2 - 10.2497/jjspm.45.655
DO - 10.2497/jjspm.45.655
M3 - Article
AN - SCOPUS:0032117786
VL - 45
SP - 655
EP - 660
JO - Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
JF - Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
SN - 0532-8799
IS - 7
ER -