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 | |
Article | |
关键词: PENETRATION DEPTH MEASUREMENTS; D-WAVE SUPERCONDUCTIVITY; T-C SUPERCONDUCTORS; THIN-FILMS; TUNNELING SPECTROSCOPY; TEMPERATURE-DEPENDENCE; ANDREEV REFLECTIONS; PAIRING SYMMETRY; SURFACE-STATES; BOUND-STATES; | |
DOI : 10.1103/PhysRevB.68.024502 | |
来源: SCIE |
【 摘 要 】
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 (Hgreater than or equal toH(c2)) for all dopings.
【 授权许可】
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