Charge modulation at the surface of high-Tc superconductors

Thorsten Emig; Kirill Samokhin; Stefan Scheidl

doi:10.1103/PhysRevB.56.8386

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Charge modulation at the surface of high-Tc superconductors

Thorsten Emig, Kirill Samokhin, Stefan Scheidl

DOI 10.1103/PhysRevB.56.8386 · Physical Review B

T1

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Abstract

It is shown here that surfaces of high-temperature superconductors are covered by dipole layers. The charge-density modulation is induced by the local suppression of the gap function at the surface. This effect is studied in the framework of the Ginzburg-Landau theory and crucially depends on the appropriate boundary conditions. Those are derived from Gor’kov’s equations for a d-wave pairing symmetry. Within this framework the structure of the surface dipole layer is determined. The contribution of this charging to a lens effect of superconducting films with holes, which has been studied in recent experiments, is discussed.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown