Point-contact spectroscopy of the electron-doped cuprate superconductor Pr2-xCexCuO4: The dependence of conductance-voltage spectra on cerium doping, barrier strength, and magnetic field

M. Qazilbash, Amlan Biswas, Y. Dagan, A. Ott, L. Greene

Research output: Contribution to journalArticlepeer-review

Abstract

We present conductance-voltage (G-V) data for point-contact junctions between a normal metal and the electron-doped cuprate superconductor Pr2-xCexCuO4 (PCCO). We observe a zero-bias conductance peak for the underdoped composition of this cuprate (x=0.13) which is consistent with d-wave pairing symmetry. For optimally doped (x=0.15) and overdoped (x=0.17) PCCO, we find that the G-V characteristics indicate the presence of an order parameter without nodes. We investigate this further by obtaining point-contact spectroscopy data for different barrier strengths and as a function of magnetic field. We observe a gaplike feature at the Fermi energy in the normal state of PCCO (H>˜Hc2) for all dopings.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume68
Issue number2
DOIs
StatePublished - 2003
Externally publishedYes

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