Pairing Theory of Striped Superconductivity

Abstract

Striped high-$T_{\mathrm{c}}$ superconductors such as La${}_{2-y-x}$Nd${}_y$Sr${}_x$CuO${}_4$ and La${}_{2-x}$Ba${}_x$CuO${}_4$ near $x=1/8$ show a fascinating competition between spin and charge order and superconductivity. A theory for these systems therefore has to capture both the spin correlations of an antiferromagnet and the pair correlations of a superconductor. For this purpose we present here an effective Hartree-Fock theory incorporating both electron pairing with finite center-of-mass momentum and antiferromagnetism. We show that this theory reproduces the key experimental features such as the formation of the antiferromagnetic stripe patterns at 7/8 band filling or the quasi one-dimensional electronic structure observed by photoemission spectroscopy.

4 pagesw, 4 figures

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