Theory of the striped superconductor

Details Theory of the striped superconductor Theory of the striped superconductor

2008-10-09

arxiv.org/abs/0810.1564v4

Phys. Rev. B 79, 064515 (2009)

Physics

Condensed Matter

Superconductivity

16 pages, 3 figures, 1 table; Journal ref. added

Scientific paper

10.1103/PhysRevB.79.064515

We define a distinct phase of matter, a "pair density wave" (PDW), in which the superconducting order parameter $\phi$ varies periodically as a function of position such that when averaged over the center of mass position, all components of $\phi$ vanish identically. Specifically, we study the simplest, unidirectional PDW, the "striped superconductor," which we argue may be at the heart of a number of spectacular experimental anomalies that have been observed in the failed high temperature superconductor, La$_{2-x}$ Ba$_x$CuO$_4$. We present a solvable microscopic model with strong electron-electron interactions which supports a PDW groundstate. We also discuss, at the level of Landau theory, the nature of the coupling between the PDW and other order parameters, and the origins and some consequences of the unusual sensitivity of this state to quenched disorder.

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