Robustness of the midgap states predicted to exist on a [l brace]110[r brace] surface of a [ital d][sub [ital x][sup 2][sub [ital a]][minus][ital x][sup 2][sub [ital b]]]-wave superconductor
- Texas Center for Superconductivity, University of Houston, Houston, Texas 77204 (United States)
- Texas Center for Superconductivity, University of Houston, Houston, Texas 77204 (United States) Center for Theoretical Physics, Department of Physics, Texas A M University, College Station, Texas 77843-4242 (United States)
It was shown recently that a sizable areal density of midgap states exists on a [l brace]110[r brace] surface of a [ital d][sub [ital x]][sup 2][sub [ital a]][minus][ital x][sup 2][sub [ital b]]-wave superconductor [C.-R. Hu, Phys. Rev. Lett. [bold 72], 1526 (1994)]. Here we study how these midgap states are affected if (i) the surface is not exactly [l brace]110[r brace]; (ii) the crystalline structure is slightly orthorhombic; (iii) and (iv): the order parameter is not a pure [ital d] wave, but is [ital s]+[ital id][sub [ital x]][sup 2][sub [ital a]][minus][ital x][sup 2][sub [ital b]] and [ital d][sub [ital x]][sup 2][sub [ital a]][minus][ital x][sup 2][sub [ital b]]+[ital id][sub [ital x]][sub [ital ax]][sub [ital b]], 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 [plus minus][vert bar][Delta][sub [ital s]][vert bar]. For case (iv), the surface states exist on both [l brace]110[r brace] and [l brace]100[r brace] surfaces (and on surfaces of all other orientations) but with a [bold k]-dependent energy shift from midgap.
- OSTI ID:
- 7056742
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Vol. 50:22; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
Similar Records
Properties of epitaxial YBa sub 2 Cu sub 3 O sub 7 thin films on Al sub 2 O sub 3 l brace 1 012 r brace
Energy-resolved intramultiplet mixing in the electron-volt range for Ne[sup **][l brace](2[ital p])[sup 5](3[ital p])[r brace]+He