Macroscopic quantum tunneling in d-wave YBa2Cu3O7-δ josephson junctions -: art. no. 087003
Macroscopic quantum tunneling in d-wave YBa2Cu3O7-δ josephson junctions -: art. no. 087003
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DOI：
10.1103/physrevlett.94.087003
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发表时间：
2005-03-04
影响因子：
8.6
通讯作者：
Claeson, T
中科院分区：
文献类型：
--
作者：
Bauch, T;Lombardi, F;Claeson, T
超导约瑟夫森结（JJ）中从零电压态的逃逸速率由温度决定，但由于宏观量子隧穿（MQT），它在低温下饱和。由于高温超导体中d波对称性的复杂性，如低能准粒子和非常规的电流-相位关系，可能会影响逃逸率。我们报告，第一次我们所知，观察MQT在YBa_2Cu_3O_7-δ晶界双外延JJ。这证明了适当的结结构可以显著降低耗散，这对量子相干性有重要意义。
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 YBa2Cu3O7-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.