Robustness of the midgap states predicted to exist on a {110} surface of a dxa2-xb2-wave superconductor
Jian Yang, Chia-Ren Hu
DOI 10.1103/PhysRevB.50.16766 · Physical Review B
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Abstract
It was shown recently that a sizable areal density of midgap states exists on a {110} surface of a dxa2-xb2-wave superconductor [C.-R. Hu, Phys. Rev. Lett. 72, 1526 (1994)]. Here we study how these midgap states are affected if (i) the surface is not exactly {110}; (ii) the crystalline structure is slightly orthorhombic; (iii) and (iv): the order parameter is not a pure d wave, but is s+idxa2-xb2 and dxa2-xb2+idxaxb, respectively. We find that for cases (i) and (ii), the midgap surface states still exist but with reduced areal density. For case (iii), all surface-state energies are found to shift away from midgap to ±‖Δs‖. For case (iv), the surface states exist on both {110} and {100} surfaces (and on surfaces of all other orientations) but with a k-dependent energy shift from midgap.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ 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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