Chesca B, Schulz R R, Goetz B, Schneider C W, Hilgenkamp H, Mannhart J
Experimentalphysik VI, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany.
Phys Rev Lett. 2002 Apr 29;88(17):177003. doi: 10.1103/PhysRevLett.88.177003. Epub 2002 Apr 16.
A dc pi SQUID consists of a superconducting ring interrupted by two Josephson junctions, one of which carries in equilibrium a pi phase difference, caused, for example, by the d-wave pairing symmetry of the high- T(c) cuprates. If this phase shift is maintained in the voltage state, anomalous resonance currents are expected in the SQUIDs transport characteristics. Here we report the observation of such resonances for high- T(c) dc pi SQUIDs, providing evidence for the influence of the d-wave symmetry on the voltage state of a Josephson junction for frequencies of several tens of GHz.
一个直流π型超导量子干涉器件（SQUID）由一个被两个约瑟夫森结中断的超导环组成，其中一个结在平衡状态下具有π相位差，例如，这是由高温铜酸盐的d波配对对称性引起的。如果这种相移在电压状态下得以维持，那么在SQUID的传输特性中就会预期出现异常共振电流。在此，我们报告了对高温直流π型SQUID此类共振的观测结果，为d波对称性在几十吉赫兹频率下对约瑟夫森结电压状态的影响提供了证据。
