Superconductivity: Exotic Commonalities in Phase and Mode

TL;DR

This paper discusses common features in phase diagrams and magnetic resonance modes across various unconventional superconductors and superfluid helium, highlighting potential universalities in their underlying physics.

Contribution

It identifies and compares phase transition characteristics and magnetic resonance behaviors in FeAs-based superconductors with other unconventional superconductors and superfluid helium.

Findings

First-order transition from antiferromagnetic to superconducting states

Magnetic resonance mode energy scales with $4 k_{B}T_{c}$

Striking similarities across diverse quantum fluids

Abstract

Recent muon and neutron experiments on the new FeAs-based superconductors revealed phase diagrams characterized by first-order evolution from antiferromagnetic to superconducting states, and an inelastic magnetic resonance mode whose energy scales as $\sim 4 k_{B}T_{c}$. These features exhibit striking commonalities with cuprate, backyball, organic, and heavy-fermion superconductors as well as superfluid $^{4}$He.