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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