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Journal of Superconductivity

, Volume 5, Issue 4, pp 339–344 | Cite as

Two-gap superconductivity and microwave properties of YBCO

  • Antonello Andreone
  • Vladimir Z. Kresin
  • Stuart A. Wolf
Article

Abstract

The YBa2Cu3O7−x compound contains two conductive subsystem and as a result displays a two-gap structure. The Cu-O2 planes are characterized by intrinsic pairing, whereas the superconducting state of the Cu-O chains is induced by two different charge-transfer channels (intrinsic proximity effect and phonon-mediated transfer). Oxygen ordering affects the value of the induced energy gap. Such spectrum along with a short coherence length lead to peculiar microwave properties of YBCO thin films. The large residual microwave losses are explained in the framework of the two-gap model.

Key words

YBa2Cu3O7−x Cu-O2 planes Cu-O chains induced superconductivity microwave losses 

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Copyright information

© Plenum Publishing Corporation 1992

Authors and Affiliations

  • Antonello Andreone
    • 1
  • Vladimir Z. Kresin
    • 1
  • Stuart A. Wolf
    • 2
  1. 1.Lawrence Berkeley LaboratoryUniversity of CaliforniaBerkeley
  2. 2.Naval Research LaboratoryWashington, DC

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