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Proceedings Paper

Andreev reflection and superconducting bound states in high-Tc junctions
Author(s): Goran P. Wendin; Tomas Loefwander; Vitaly S. Shumeiko
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Paper Abstract

Midgap states (MGS) exist at the Fermi level at surfaces and interfaces of d-wave superconductors for order parameter orientations such that a sign change of Andreev reflection can add a (pi) -shift in the Bohr-Sommerfeld quantization condition. MGS are basically robust features, but the detailed density of states, manifested e.g. in zero bias conductance peaks (ZBCP), is in principle a sensitive probe of junctions and interfaces, providing information about normal regions with suppressed order parameter, non-specular scattering from rough or disordered interfaces, impurity states, lifetimes, etc. Resonance coupling of MGS in d45/d+/- 45 SNINS junctions gives rise to large equilibrium Josephson critical current varies direct as (root)D, where D is the normal transparency of the junction. Spontaneous time-reversal symmetry breaking (TRSB) in d0/d45 junctions at low temperatures kBT << D(Delta) 0 is driven by a gain in Josephson energy for transparencies D >> (epsilon) 0/(lambda) .

Paper Details

Date Published: 6 September 2000
PDF: 12 pages
Proc. SPIE 4058, Superconducting and Related Oxides: Physics and Nanoengineering IV, (6 September 2000); doi: 10.1117/12.397840
Show Author Affiliations
Goran P. Wendin, Chalmers Univ. of Technology and Goteburg Univ. (Sweden)
Tomas Loefwander, Chalmers Univ. of Technology and Goteburg Univ. (Sweden)
Vitaly S. Shumeiko, Chalmers Univ. of Technology and Goteburg Univ. (Sweden)


Published in SPIE Proceedings Vol. 4058:
Superconducting and Related Oxides: Physics and Nanoengineering IV
Davor Pavuna; Ivan Bozovic, Editor(s)

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