Microwave and sub-millimeter wave measurements of Y1-xCaxBa2Cu3O7-delta flims: Evidence of time-reversal symmetry breaking

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Abstract

In the present report we show the evolution of the order parameter with doping for Y1-xCaxBa2Cu3O 7-δ thin films. The penetration depth results for overdoped Y0.9Ca0.1Ba2Cu3O7- δ films are well fitted to a complex order parameter of the form Δ dx2 - y2 + i δ dxy, while the underdoped films yield a pure dx2 - y2-wave. The complex order parameter indicates broken time-reversal symmetry.

Original languageEnglish
Pages (from-to)912-913
Number of pages2
JournalPhysica C: Superconductivity and its Applications
Volume460-462 II
Issue numberSPEC. ISS.
DOIs
StatePublished - 1 Sep 2007

Keywords

  • Order parameter
  • Overdoped superconductors
  • Penetration depth

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