Quartett formation at (100)/(110)-interfaces of d-wave superconductors

Details Quartett formation at (100)/(110)-interfaces of d-wave superconductors Quartett formation at (100)/(110)-interfaces of d-wave superconductors

2004-10-15

arxiv.org/abs/cond-mat/0410401v1

Physics

Condensed Matter

Strongly Correlated Electrons

13 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.94.247004

Across a faceted (100)/(110) interface between two d-wave-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 boosts boson binding at the interface -- a phenomenon, which is intimately tied to the staggered sequence of 0- and Pi-junction contacts along the interface. We connect this finding to the recently observed h/4e oscillations in (100)/(110) SQUIDS of cuprate superconductors.

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