Strong magnetic fluctuations in superconducting state of CeCoIn$_5$

TL;DR

This study investigates vortex core dissipation in CeCoIn$_5$, revealing that magnetic fluctuations significantly influence superconducting properties and flux flow resistivity.

Contribution

It demonstrates the link between magnetic fluctuations and vortex core dissipation in CeCoIn$_5$, highlighting the role of magnetism in superconductivity.

Findings

Vortex core resistivity increases sharply below the superconducting transition.

Magnetic fluctuations cause quasiparticle scattering affecting resistivity.

Magnetism and superconductivity are interconnected in CeCoIn$_5$.

Abstract

We show results on the vortex core dissipation through current-voltage measurements under applied pressure and magnetic field in the superconducting phase of CeCoIn$_5$. We find that as soon as the system becomes superconducting, the vortex core resistivity increases sharply as the temperature and magnetic field decrease. The sharp increase in flux flow resistivity is due to quasiparticle scattering on critical antiferromagnetic fluctuations. The strength of magnetic fluctuations below the superconducting transition suggests that magnetism is complimentary to superconductivity and therefore must be considered in order to fully account for the low-temperature properties of CeCoIn$_5$.