Theory of point-contact spectroscopy in electron-doped cuprate superconductors

C. S. Liu, W. C. Wu

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Abstract

In the hole-doped d x2 - y2 -wave cuprate superconductors, due to the midgap surface state (MSS), a zero-bias conductance peak (ZBCP) is widely observed in [110] interface point-contact spectroscopy (PCS). However, a ZBCP of this geometry is rarely observed in the electron-doped cuprates, even though their pairing symmetry is still likely of the d x2 - y2 wave type. We argue that this is due to the coexistence of antiferromagnetic (AF) and superconducting orders. Generalizing the Blonder-Tinkham-Klapwijk formula to include an AF coupling, it is shown explicitly that the MSS is destroyed by the AF order. The calculated PCS is in good agreement with the experiments.

Original languageEnglish
Article number220504
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number22
DOIs
Publication statusPublished - 2007 Dec 6

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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