Recent experimental results on the physics of high temperature superconductivity (HTS) related to coherent phenomena and unconventional pairing symmetry are discussed. Some consequences of the d-wave order parameter symmetry on the phenomenology of HTS junctions of different type are investigated. The attention is focused on recent experiments based on biepitaxial YBa2Cu3O7-delta Josephson structures where junctions with a pi shift in the phase have been reproducibly obtained. Anisotropy measurements confirm the relevance of effects of d-wave order parameter symmetry on the properties of the junctions, and prove that intrinsic d-wave effects can be predominant over extrinsic effects. The possibility to obtain some kind of tunnel-like barriers and to tune d-wave effects through a suitable geometry has been demonstrated opening some perspectives towards novel device concepts within the framework of pi circuitry and "quiet qubit".
Effects of d-wave symmetry in high-TC grain boundary Josephson junctions
TAFURI, Francesco;
2004
Abstract
Recent experimental results on the physics of high temperature superconductivity (HTS) related to coherent phenomena and unconventional pairing symmetry are discussed. Some consequences of the d-wave order parameter symmetry on the phenomenology of HTS junctions of different type are investigated. The attention is focused on recent experiments based on biepitaxial YBa2Cu3O7-delta Josephson structures where junctions with a pi shift in the phase have been reproducibly obtained. Anisotropy measurements confirm the relevance of effects of d-wave order parameter symmetry on the properties of the junctions, and prove that intrinsic d-wave effects can be predominant over extrinsic effects. The possibility to obtain some kind of tunnel-like barriers and to tune d-wave effects through a suitable geometry has been demonstrated opening some perspectives towards novel device concepts within the framework of pi circuitry and "quiet qubit".I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
