Evidence of a d to s-wave pairing symmetry transition in the electron-doped cuprate superconductor Pr${}_{2-x}$Ce${}_x$CuO${}_4$

Abstract

We present point contact spectroscopy (PCS) data for junctions between a normal metal and the electron doped cuprate superconductor Pr${}_{2-x}$Ce${}_x$CuO${}_4$ (PCCO). For the underdoped compositions of this cuprate ($x\sim 0.13$) we observe a peak in the conductance-voltage characteristics of the point contact junctions. The shape and magnitude of this peak suggests the presence of Andreev bound states at the surface of underdoped PCCO which is evidence for a d-wave pairing symmetry. For overdoped PCCO ($x\sim 0.17$) the PCS data does not show any evidence of Andreev bound states at the surface suggesting an s-wave pairing symmetry.

4 pages Latex, 4 eps figures included. Submitted to Phys. Rev. Lett

References in corpus (4)

• Superconducting Gap Anisotropy in Nd${}_{1.85}$Ce${}_{0.15}$CuO${}_4$: Results from Photoemission
• Evidence of Doping-Dependent Pairing Symmetry in Cuprate Superconductors
• Identification of the bulk pairing symmetry in high-temperature superconductors: Evidence for an extended s-wave with eight line nodes
• Gapped tunneling spectra in the normal state of Pr${}_{2-x}$Ce${}_x$CuO${}_4$

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