Andreev Bound States, Surfaces and Subdominant Pairing in High Tc Superconductors

Author(s): D. Rainer, H. Burkhardt, M. Fogelström, and J. A. Sauls
Comments: Invited Paper for the Proceedings of Spectroscopies of Novel Superconductors; 4 pages with 4 figures.
Journal: J. Phys. Chem. Sol. 59, 2040 (1998) [DOI] [PDF]

A characteristic feature of the BCS theory of superconductivity is the quantum-mechanical coherence of particle and hole states. Direct observation of particle-hole coherence in unusual superconducting materials is a strong indication of traditional superconductivity. We use the Fermi liquid theory of superconductivity to study the implications of particle-hole coherence on properties of d-wave superconductors near surfaces. Typical surface phenomena are the suppression of the superconducting order parameter, surface bound states associated with Andreev reflection, anomalous screening currents, and spontaneous breaking of time-reversal symmetry. We review these phenomena and present new results for the effects of surface roughness.

Paper: [PDF] [arXiv]

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