Macroscopic quantum tunneling in d-wave YBa2Cu3O7-delta Josephson junctions |
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| Authors: | Bauch T Lombardi F Tafuri F Barone A Rotoli G Delsing P Claeson T |
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| Institution: | Quantum Device Physics Laboratory, Department of Microtechnology and Nanoscience, MC2, Chalmers University of Technology, S-412 96 G?teborg, Sweden. |
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| Abstract: | The escape rate from the zero voltage state in a superconducting Josephson junction (JJ) is determined by the temperature, but it saturates at low temperature due to macroscopic quantum tunneling (MQT). Complications due to d-wave symmetry in a high temperature superconductor, like low energy quasiparticles and an unconventional current-phase relation, may influence the escape rate. We report, for the first time to our knowledge, the observation of MQT in a YBa(2)Cu(3)O(7-delta) grain boundary biepitaxial JJ. This proves that dissipation can be significantly reduced by a proper junction configuration, which is of significance for quantum coherence. |
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