Stripes and superconductivity in cuprate superconductors

TL;DR

This paper discusses the relationship between stripe order and superconductivity in cuprates, suggesting a universal magnetic spectrum and the presence of dynamic stripes in superconducting states.

Contribution

It proposes that a universal magnetic spectrum exists in cuprates and that dynamic stripe correlations are present in superconducting samples, linking magnetic properties to superconductivity.

Findings

Magnetic excitation spectra are similar in stripe-ordered and superconducting cuprates.

A gap opens in the magnetic spectrum below the superconducting transition temperature.

The size of the spin gap correlates with the transition temperature.

Abstract

One type of order that has been observed to compete with superconductivity in cuprates involves alternating charge and antiferromagnetic stripes. Recent neutron scattering studies indicate that the magnetic excitation spectrum of a stripe-ordered sample is very similar to that observed in superconducting samples. In fact, it now appears that there may be a universal magnetic spectrum for the cuprates. One likely implication of this universal spectrum is that stripes of a dynamic form are present in the superconducting samples. On cooling through the superconducting transition temperature, a gap opens in the magnetic spectrum, and the weight lost at low energy piles up above the gap; the transition temperature is correlated with the size of the spin gap. Depending on the magnitude of the spin gap with respect to the magnetic spectrum, the enhanced magnetic scattering at low temperature can be either commensurate or incommensurate. Connections between stripe correlations and superconductivity are discussed.