Origin of the zero-bias conductance peaks observed ubiquitously in high-T-c superconductors
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Date
1998
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Publisher
American Physical Society
Abstract
The midgap surface states predicted previously to exist on non-{n0m} surfaces of d(xa2-xb2-) superconductors (SC's) can be extended to midgap interface states (MIS's), which exist at almost all interface between grains of such SC's of different principal axes orientations. They can Five rise to a zero-bias conductance peak (ZBCP) in quasiparticle tunneling along any axis as shown in our model calculation. When the counterelectrode is a low-T-c SC, its gap is shown to appear as a dip at the center of the (broadened) ZBCP. These and other results support the proposal that such MIS's are responsible for most if not all of the ZBCP's observed ubiquitously in tunneling experiments performed on high-T-c SC's.
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Keywords
D-WAVE SUPERCONDUCTORS, SCANNING TUNNELING MICROSCOPE, SYMMETRY ORDER, PARAMETERS, THIN-FILM JUNCTIONS, ENERGY-GAP, SINGLE-CRYSTALS, SURFACE, SPECTROSCOPY, STATES, BI2SR2CACU2O8, Physics
Citation
Chia-Ren HU. Phys.Rev.B 57 1266-1276 1998."Copyright (1998) by the American Physical Society."