APS » PROLA » Phys. Rev. B » Volume 56 » Issue 21

Phys. Rev. B 56, 13746 - 13749 (1997)

Correlation between d-wave pairing behavior and magnetic-field-dependent zero-bias conductance peak
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J. W. Ekin and Yizi Xu
Electromagnetic Technology Division, NIST, Boulder, Colorado 80303

S. Mao and T. Venkatesan
University of Maryland, College Park, Maryland 20742

D. W. Face
DuPont Central Research and Development, Wilmington, Delaware 19880-0304

M. Eddy
Superconductor Technologies, Inc., Santa Barbara, California 93111-2310

S. A. Wolf
Naval Research Laboratory, Washington, DC 20375

Received 18 February 1997

We consistently observe a magnetic-field-dependent conductance peak at zero-bias voltage in a wide range of superconductor/noble-metal junctions fabricated from oxide superconductors (YBa2Cu3O7-δ and Tl2Ba2CaCu2O) that have been reported to exhibit d-wave pairing behavior; however, no measurable peak appears in similar junctions made from an s-wave oxide superconductor (Nd1.85Ce0.15CuO4). Explanations of this correlation are considered in terms of the Appelbaum-Anderson model for magnetic interface scattering and the midgap-state model for d-wave interface states.


©1997 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v56/p13746
DOI: 10.1103/PhysRevB.56.13746
PACS: 74.50.+r, 74.20.Mn, 74.25.Ha, 74.72.-h

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