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

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

2001-11-28

arxiv.org/abs/cond-mat/0111544v1

Physics

Condensed Matter

Superconductivity

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

Scientific paper

10.1103/PhysRevLett.88.207004

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.

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