Quantum tunneling effects in YBa₂Cu₃O_x super-thin films

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• 作者：Chunguang Li ; Ping Zheng ; Duo Jin ; Zhaojia Chen ; Yusheng He ; Guangcheng Xiong ; Guijun Lian ; Daole Yin ; C. E. Gough
• 刊名：Physica B
• 出版年：2000
• 出版时间：July 2000
• 年：2000
• 卷：284-288
• 期：Part 1
• 页码：577-578
• 全文大小：89 K

文摘

Magnetic relaxation and V–I characteristics in 60 Å thick YBCO super-thin films have been measured. The normalized relaxation rates and the slopes of lg(V)–I curves in an applied field up to 6 T become independent of temperature below 16 K. This fact indicates that the temperature T_cr at which the vortex dynamics changes from thermal activation to quantum tunneling can be much higher than those reported previously. Analysis of experimental results suggests that the high pinning energy in YBCO super-thin films is an important factor that contributes to a high T_cr.