Origin of the zero-bias conductance peaks observed ubiquitously in high-T-c superconductors
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.
Description
Journals published by the American Physical Society can be found at http://journals.aps.org/Subject
D-WAVE SUPERCONDUCTORSSCANNING TUNNELING MICROSCOPE
SYMMETRY ORDER
PARAMETERS
THIN-FILM JUNCTIONS
ENERGY-GAP
SINGLE-CRYSTALS
SURFACE
SPECTROSCOPY
STATES
BI2SR2CACU2O8
Physics