Linear Field Dependence of the Normal-State In-Plane Magnetoresistance of Sr2RuO4

TL;DR

This study reveals a linear magnetic-field dependence of in-plane magnetoresistance in Sr2RuO4's normal state, indicating a novel coherent state with a spin pseudo gap, challenging conventional electronic band theory.

Contribution

It reports the discovery of linear field dependence of magnetoresistance in Sr2RuO4, suggesting a new coherent state with a spin pseudo gap.

Findings

Positive linear magnetoresistance above threshold field

Deviation from electronic band theory predictions

Evidence of a spin pseudo gap in the quasi-particle spectrum

Abstract

The transverse and longitudinal in-plane magnetoresistances in the normal state of superconducting Sr2RuO4 single crystals have been measured. At low temperatures, both of them were found to be positive with a linear magnetic-field dependence above a threshold field, a result not expected from electronic band theory. We argue that such behavior is a manifestation of a novel coherent state characterized by a spin pseudo gap in the quasi-particle excitation spectrum in Sr2RuO4.