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Low-temperature quantum relaxation of single two-dimensional vortices in an epitaxial Tl2Ba2Ca2Cu3Ox thin film
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Time-logarithmic magnetic-relaxation measurements have been obtained in an epitaxial
Tl
2
Ba
2
Ca
2
Cu
3
O
x
thin film for the zero-field cooled and remanent magnetization, with low and moderate applied magnetic fields. With low fields (
H
a
=50 Oe), the normalized magnetic relaxation rates, S≡‖d(M/
M
i
)/d lnt‖, are temperature independent below T≃3.4 K, and the transition from the thermal to the quantum regime appears to be quite sharp. With moderate fields (
H
a
=500 Oe), the transition becomes smooth and takes place at temperatures higher than with low fields, T≃7 K. This seems to indicate that the mechanism responsible for low-temperature relaxation would be nondissipative Hall tunneling of two-dimensional vortices, rather than dissipative vortex motion.
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GARCÍA SANTIAGO, Antoni, et al. Low-temperature quantum relaxation of single two-dimensional vortices in an epitaxial Tl2Ba2Ca2Cu3Ox thin film. Physical Review B. 1994. Vol. 50, num. 13, pags. 9439-9444. ISSN 0163-1829. [consulted: 4 of August of 2026]. Available at: https://hdl.handle.net/2445/9723