A model description of the supersolid state in YBCO

TL;DR

This paper models the coexistence of superconductivity and charge density waves in YBCO using a pseudospin framework, linking disorder-induced scattering to observed resistivity behavior.

Contribution

It introduces a semiphenomenological pseudospin model to describe the supersolid state in YBCO, connecting disorder effects to experimental resistivity features.

Findings

Pseudospin model describes coexistence of SC and CDW in YBCO.

Disorder creates pseudospins causing inelastic electron scattering.

Scattering explains the logarithmic resistivity upturn at low doping.

Abstract

I employ a semiphenomenological model introduced in A. M. Tsvelik, A. V. Chubukov, Phys. Rev. Lett. {\bf 98}, 237001 (2007) to describe the state with co-existing superconductivity (SC) and charge density wave (CDW) recently discovered in YBCO. The SC and the CDW order parameter fields are united in a single pseudospin and can be rotated into each other. It is suggested that disorder creates isolated pseudospins which become centers of inelastic scattering of electrons. It is suggested that this scattering is responsible for the logarithmic upturn in the resistivity $\rho(T) \sim - \ln T$ observed at low doping.