Angular Dependence of Magnetization and Magnetic Relaxation in Y-Ba-Cu-O High-T c Superconductor

Kenichi Tenya,Shuichi Kohayashi,Yoshichika Otani,Shuji Yoshizawa,Yuuichi Ishikawa,Hideki Miyajima

doi:10.1007/978-4-431-68266-0_127

Angular Dependence of Magnetization and Magnetic Relaxation in Y-Ba-Cu-O High-T c Superconductor

Kenichi Tenya, Shuichi Kohayashi + Show 4 more

https://doi.org/10.1007/978-4-431-68266-0_127

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Publication Date: Jan 1, 1994

Affiliation: Keio University, Sumitomo Metal Mining (Japan)

#Magnetic Torque #Magnetic Relaxation + Show 8 more

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Abstract

Structural influence on flux pinning properties of Y-Ba-Cu-O superconductors was investigated in terms of angular variations of magnetization, magnetic relaxation and magnetic torque. Magnetization and magnetic torque take a local maximum at θ=90° where θ is the angle between the c-axis and applied magnetic field. On the other hand, magnetic relaxation rate S=M -1dM/dlog t takes a maximum at θ=60°~70° where the pinned fluxoids changes their form from linear to stepwise. At this angle range, the effective pinning potential is apparently reduced due to the competition between the intrinsic pinning and additional extrinsic pinning due to precipitates.

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