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Influence of surface roughness on subdominant pairing in d ‐wave superconductors
Author(s) -
Lück T.
Publication year - 2003
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.200310021
Subject(s) - subdominant , pairing , physics , symmetry (geometry) , surface roughness , surface (topology) , condensed matter physics , superconductivity , order (exchange) , component (thermodynamics) , surface finish , quantum mechanics , materials science , biology , mathematics , geometry , biochemistry , cytotoxic t cell , finance , economics , in vitro , composite material
We study a d ‐wave superconductor with dominant d x 2 ‐ y 2‐wave order parameter and subdominant pairing in either the s ‐ or the d xy ‐wave channel near a surface. In particular we analyze the influence of surface roughness on the mixed order parameter which may break the time‐reversal symmetry. We find that the subdominant component is suppressed by the roughness independent of its pairing symmetry; for very rough surfaces the subdominant component may even vanish completely. Additionally we discuss a possible real‐valued admixture which counteracts the suppression of the d x 2 ‐ y 2‐wave order parameter at the surface.