Low temperature electronic properties of Sr_2RuO_4 I: Microscopic model and normal state properties

TL;DR

This paper develops a microscopic bosonized model for Sr_2RuO_4's normal state, explaining magnetic correlations, specific heat, mass enhancement, susceptibility, and resistivity through a quasi-one-dimensional approach.

Contribution

It introduces a bosonized microscopic model based on quasi-one-dimensional kinetic energy that captures key normal state properties of Sr_2RuO_4.

Findings

Magnetic correlations have a quasi-one-dimensional component along diagonals.

Model accounts for specific heat, cyclotron mass, susceptibility, and Wilson ratio.

Explains anomalous high-temperature resistivity.

Abstract

Starting from the quasi one-dimensional kinetic energy of the d_{yz} and d_{zx} bands we derive a bosonized description of the correlated electron system in Sr_2RuO_4. At intermediate coupling the magnetic correlations have a quasi one-dimensional component along the diagonals of the basal plane of the tetragonal unit cell that accounts for the observed neutron scattering results. Together with two-dimensional correlations the model consistently accounts for the normal phase specific heat, cyclotron mass enhancement, static susceptibility, and Wilson ratio and implies an anomalous high temperature resistivity.