Angle-dependent magnetic-relaxation studies in YBCO thin film

• Main Authors: Miao-Hsin Wu, 吳妙欣
• Other Authors: Herng-Er Horng
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/37624976057222418066

碩士 === 國立師範大學 === 物理研究所 === 82 === We take YBCO thin film as experimental sample. By measuring the magnetization, we know the critical temperature of the sample is about 90 K. In order to realize the relation between magnetic relaxation and angle, we fix the external field as 5000 Gauss, change the angle from 0 degree to 90 degree, and measure the magnetization variation with time. We analyze the results by Anderson-Kim model, Power law, and Vortex-Glass model. By the data of 90 degree, we know that after 600 seconds ,those three models lead to a similar kT/Up value, about 0.0073 . With the same method, we observe the magnetic relaxation of other angles, and find that the relaxation rate in higher angle is slower than that in lower angle.