Quartet Formation at (100)/(110) Interfaces of d-Wave Superconductors
A. A. Aligia, A. P. Kampf, J. Mannhart
DOI 10.1103/PhysRevLett.94.247004 · Physical Review Letters
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Abstract
Across a faceted (100)/(110) interface between two dx2−y2 superconductors the structure of the superconducting order parameter leads to an alternating sign of the local Josephson coupling. Describing the Cooper pair motion along and across the interface by a one-dimensional boson lattice model, we show that a small attractive interaction between the bosons strongly enhances their binding at the interface. As a consequence, we propose that electrons tunnel in quartets across an interface with a staggered sequence of 0- and π-junction contacts. We connect this finding to the recently observed h/4e oscillations in bicrystalline (100)/(110) SQUIDs of cuprate superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ 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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