Statistical fluxes and the Curie-Weiss metal state

TL;DR

This paper predicts a novel quantum state in the high doping regime of the triangular t-J model, characterized by localized spins and a Bose metal charge carrier, explaining several experimental observations in Na$_x$CoO$_2$.

Contribution

It introduces a new state of matter with unique spin and charge properties, distinct from Fermi-liquid behavior, applicable to high doping regimes.

Findings

Predicts a Curie-Weiss susceptibility in the new state

Explains large thermopower and linear resistivity in Na$_x$CoO$_2$

Provides a neutron scattering signature for experimental verification

Abstract

We predict a new state of matter in the triangular t-J model in a high doping regime. Due to the altered role of quantum statistics the spins are `localized' in statistical Landau orbits, while the charge carriers form a Bose metal that feels the spins through random gauge fields. In contrast to the Fermi-liquid state, this state naturally exhibits a Curie-Weiss susceptibility, large thermopower, and linear-temperature resistivity, explaining the physics of \textrm{Na}$_{x}$\textrm{CoO}$_{2}$ at $x>0.5.$ A `smoking gun' prediction for neutron scattering is presented.