On the Normal State Electronic properties of Layered Sr_2 RuO_4

TL;DR

This paper develops a microscopic model for the normal state of layered Sr_2 RuO_4, explaining high-temperature anomalies with a Luttinger liquid framework and a crossover to Fermi liquid behavior at low temperatures.

Contribution

It introduces a comprehensive microscopic model incorporating quantum chemical features and explains the dimensional crossover using chain-DMFT.

Findings

High-T anomalies explained by Luttinger liquid behavior

Identification of a crossover scale E* to Fermi liquid state

Consistent explanation of low-T normal state features

Abstract

Based on a comprehensive perusal of experimental results, we construct a microscopic model describing the normal state of layered 4d oxide Sr_2 RuO_4 incorporating relevant quantum chemical features of the material. The high-T anomalies are explained within a Luttinger liquid (LL) picture. Interlayer one-particle hopping drives a dimensional crossover to a correlated Fermi liquid below a scale E^{*} << t_{perp}. Using recently developed chain-dynamical mean field theory, the low value of E^{*}, as well as various puzzling features of the low-T normal state are explained as manifestations of the crossover from the high-T Luttinger liquid state in a consistent way.