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Recent Achievements on the Physics of High-T C Superconductor Josephson Junctions: Background, Perspectives and Inspiration

  • Francesco Tafuri
  • Davide Massarotti
  • Luca Galletti
  • Daniela Stornaiuolo
  • Domenico Montemurro
  • Luigi Longobardi
  • Procolo Lucignano
  • Giacomo Rotoli
  • Giovanni Piero Pepe
  • Arturo Tagliacozzo
  • Floriana Lombardi
Review Article

Abstract

Coherent passage of Cooper pairs in a Josephson junction (JJ) above the liquid nitrogen temperature has been the first impressive revolutionary effect induced by high critical temperature superconductors (HTS) in the domain of the study of Josephson effect (JE). But this has been only the start. A d-wave order parameter has lead to significant novel insights in the physics of the JE turning into a device the notion of a π-junction. Spontaneous currents in a frustrated geometry, Andreev bound states, long-range proximity effect have rapidly become standard terms in the study of the JE, standing as a reference bench for conventional systems based on low critical temperature superconductors (LTS) and inspiring analogies for junctions based on novel superconductors discovered in the meantime. The extreme richness of the physics of HTS JJs has not been adequately supported by the expected impact in the applications, the main reason lying in the complexity of these materials and in the consequent unsatisfactory yield and reproducibility of the performances of the JJs within the required limits. The continuous progress in material science, and specifically in the realization of oxide multi-layers, and in nanotechnologies applied to superconductors, accompanied by the advances in a better understanding of the properties of HTS and of HTS devices, has as a matter of fact opened possible novel scenarios and interest in the field. We intend to give a brief overview on interesting new problems concerning HTS JJs of inspiration also for other systems. We also review some ideas and experimental techniques on macroscopic quantum decay phenomena occurring in Josephson structures. The attention is mainly addressed to intermediate levels of dissipation, which characterize a large majority of low critical current Josephson devices and are therefore an unavoidable consequence of nanotechnology applied more and more to Josephson devices.

Keywords

Josephson effect High TC superconductors Macroscopic quantum phenomena Nanostructures 

Notes

Acknowledgements

Special thanks to John Kirtley for sharing so many common interests in several experiments reviewed in this manuscript. We would also like to thank Thilo Bauch and Chang Tsuei for valuable discussions on the topics of this contribution. This work is supported by MIUR PRIN 2009 under the project SuFET based on nanowires and HTS. We also acknowledge partial support by STREP Macroscopic Interference Devices for atomic and Solid State Physics: Quantum Control of Supercurrents and by a Marie Curie International Reintegration Grant No. 248933 hybMQC within the 7th European Community Framework Programme.

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Francesco Tafuri
    • 1
    • 2
  • Davide Massarotti
    • 2
    • 3
  • Luca Galletti
    • 2
    • 3
  • Daniela Stornaiuolo
    • 2
    • 3
  • Domenico Montemurro
    • 4
  • Luigi Longobardi
    • 1
  • Procolo Lucignano
    • 3
    • 5
  • Giacomo Rotoli
    • 1
  • Giovanni Piero Pepe
    • 2
    • 3
  • Arturo Tagliacozzo
    • 2
    • 3
  • Floriana Lombardi
    • 6
  1. 1.Dip. di Ingegneria dell’InformazioneSeconda Università degli Studi di NapoliAversa (Ce)Italy
  2. 2.CNR-SPINNapoliItaly
  3. 3.Dip. Scienze FisicheUniversità di Napoli Federico IINapoliItaly
  4. 4.NEST-Scuola Normale Superiore and Istituto Nanoscienze–CNRPisaItaly
  5. 5.CNR-ISCRomaItaly
  6. 6.Dept. of Microtechnology and NanoscienceChalmers University of TechnologyGöteborgSweden

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