Phase oscillations between two superconducting condensates in cuprate superconductors

TL;DR

This paper explores the concept of two coupled superconducting condensates in cuprate superconductors, predicting a collective phase oscillation called a phason, and suggests experimental detection via SQUID dynamic resistance.

Contribution

It introduces a model describing superconductivity in cuprates as two coupled condensates and predicts a new collective excitation, the phason, related to their relative phase oscillation.

Findings

Superconductivity in cuprates can be modeled with two coupled condensates.

A collective excitation called a phason is predicted.

Potential experimental detection via SQUID dynamic resistance is discussed.

Abstract

Implications of the small Fermi surface are discussed. We demonstrate that superconductivity in this system can be described in terms of two coupled condensates. The two condensates result in a collective excitation corresponding to the relative phase oscillation - a phason. We discuss the possibility of searching for this collective excitation in the dynamic resistance of the SQUID.