Thermally activated flux motion and quantum creep in YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub> and Y<sub>2</sub>Ba<sub>4</sub>Cu<sub>8</sub>O<sub>16</sub> films

Journal article (1993)

Authors

Hai-Hu Wen Hai-Hu Vrije Universiteit Amsterdam
Ronald Griessen Vrije Universiteit Amsterdam
D. G. de Groot Vrije Universiteit Amsterdam
B. Dam Vrije Universiteit Amsterdam
Jan H. Rector Vrije Universiteit Amsterdam
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Published Date

1993

Language

English

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Abstract

The dynamical relaxation rate Q dln js/dln(dB/dt) where js is the current induced in a superconductor when the external field is swept at a rate dB/dt, has been measured in YBa2Cu3O7 and Y2Ba4Cu8O16 films of 100 nm and 180 nm thickness as a function of magnetic field at temperatures between 2 K and Tc. The data show i) a non zero relaxation at low T due to quantum creep, ii) a plateau between 15 and ∼ 50 K and iii) a divergence when T approaches the irreversibility line. The data are analyzed within the collective pinning model. At low temperatures it is shown that both js and Q are influenced by quantum creep.