Emergence of non-Fermi liquid behaviors in 5d perovskite SrIrO3 thin films: interplay between correlation, disorder, and spin-orbit coupling

TL;DR

This study reveals how strain-induced changes in 5d SrIrO3 thin films lead to non-Fermi liquid behaviors due to the interplay of electron correlation, disorder, and spin-orbit coupling, supported by experimental and theoretical analysis.

Contribution

It demonstrates the emergence of non-Fermi liquid behaviors in SrIrO3 thin films under strain, highlighting the role of correlation, disorder, and spin-orbit coupling in these phenomena.

Findings

Resistivity exponent varies from 4/5 to 1 to 3/2 with strain

Magnetoresistance remains positive despite resistivity upturns

Theoretical framework supports experimental observations

Abstract

We investigate the effects of compressive strain on the electrical resistivity of 5d iridium based perovskite SrIrO3 by depositing epitaxial films of thickness 35 nm on various substrates such as GdScO3 (110), DyScO3 (110), and SrTiO3 (001). Surprisingly, we find anomalous transport behaviors in the tempeature dependent resistivity, where the temperature exponent evolves continuously from 4/5 to 1 and to 3/2 with an increase of compressive strain. Furthermore, magnetoresistance always remains positive irrespective of resistivity upturns at low temperatures. These observations imply that the delicate interplay between correlation and disorder in the presence of strong spin-orbit coupling is responsible for the emergence of the non-Fermi liquid behaviors in 5d perovskite SrIrO3 thin films. We offer a theoretical framework for the interpretation of the experimental results.