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.
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Luo et al. (2002) studied this question.
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