Fresnel aperture diffraction: A phase-sensitive probe of the pairing symmetry of a superconductor
C. S. Liu, W. C. Wu
DOI 10.1103/PhysRevB.83.132508 · Physical Review B
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Abstract
Fresnel single aperture diffraction (FSAD) is proposed as a phase-sensitive probe for pairing symmetry and Fermi surface of a superconductor. We consider electrons injected, through a small aperture, into a thin superconducting (SC) layer. It is shown that in case of SC gap symmetry Δ(−kx,k∥)=Δ(kx,k∥) with kx and k∥ respectively the normal and parallel components of the electron Fermi wave vector, the quasiparticle FSAD pattern developed at the image plane is zeroth-order minimum if kxx=nπ (n is an integer and x is SC layer thickness). In contrast, if Δ(−kx,k∥)=−Δ(kx,k∥), the corresponding FSAD pattern is zeroth-order maximum. Observable consequences are discussed for iron-based superconductors of complex multiband pairings.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaO1-xFxFeAs 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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