Origin of the zero-bias conductance peaks observed ubiquitously in high-T{sub c} superconductors
- Department of Physics, Texas AM University, College Station, Texas 77843-4242 (United States)
The midgap surface states predicted previously to exist on non-{l_brace}n0m{r_brace} surfaces of d{sub x{sub a}{sup 2}{minus}x{sub b}{sup 2}}-wave superconductors (SC{close_quote}s) can be extended to midgap interface states (MIS{close_quote}s), which exist at almost all interfaces between grains of such SC{close_quote}s of different principal axes orientations. They can give 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{sub 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{close_quote}s are responsible for most if not all of the ZBCP{close_quote}s observed ubiquitously in tunneling experiments performed on high-T{sub c} SC{close_quote}s. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 573817
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 57, Issue 2; Other Information: PBD: Jan 1998
- Country of Publication:
- United States
- Language:
- English
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