Magnetic relaxation study of macroscopic quantum tunnelling in YBCO films

S Luo, CU Li, Y He, Colin Gough

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Magnetic relaxation and I-V characteristics of YBCO films with a thickness ranging from 2.4 to 200 nm have been studied. Magnetic relaxation measurements show strong quantum tunnelling effects at temperatures as high as T-cr = 8.5-15 K in ultra-thin films (2.4-40 nm), whereas in 200 nm film it is dominated by thermal activation down to 4.2 K. The high T-cr of ultra-thin films is interpreted using Blatter's dissipative tunnelling theory. The strong quantum fluctuations in the ultra-thin films are explained by their large normal state resistivity and higher activation energy compared to thicker films.
Original languageEnglish
Pages (from-to)1300-1303
Number of pages4
JournalSuperconductor Science & Technology
Volume15
Issue number9
Early online date24 Jul 2002
DOIs
Publication statusPublished - 1 Sept 2002

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