Volume 54, Number 4, May 2001
|Page(s)||515 - 521|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 December 2003|
Observation of nonequilibrium libration states in a single-junction superconducting quantum interferometer
Institute for Physical High Technology,
Department of Cryoelectronics D-07702 Jena, Germany
2 Max-Planck Institut für Physik Komplexer Systeme - D-01187 Dresden, Germany
3 Department of Interdisciplinary Studies, Faculty of Engineering Tel Aviv University - Tel Aviv 59978, Israel
Accepted: 8 March 2001
We report an experimental and theoretical study of various metastable states of a superconducting loop including a Josephson junction (a single-junction superconducting quantum interferometer). In the experiment, the metastable states manifest themselves by sharp drops in the magnetic-field dependence of the interferometer's response to an externally applied weak alternating bias current. At low temperatures we also observe satellite drops that appear at small values of ac bias. By making use of a mapping to the theory of nonlinear oscillator, we argue that this feature is due to the presence of nonequilibrium ac-induced libration states of the interferometer.
PACS: 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects / 05.45.-a – Nonlinear dynamics and nonlinear dynamical system
© EDP Sciences, 2001
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