Origin of the zero-bias conductance peaks observed ubiquitously in high-Tc superconductors
Chia-Ren Hu
DOI 10.1103/PhysRevB.57.1266 · Physical Review B
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Abstract
The midgap surface states predicted previously to exist on non-{n0m} surfaces of dxa2−xb2-wave superconductors (SC’s) can be extended to midgap interface states (MIS’s), which exist at almost all interfaces between grains of such SC’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-Tc 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-Tc SC’s.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| PrBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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