Epitaxial stabilization of metastable 3C BaRuO3 thin film with ferromagnetic non-Fermi liquid phase

TL;DR

This study reports the successful epitaxial stabilization of metastable 3C BaRuO3 thin films, revealing ferromagnetism and non-Fermi liquid behavior, advancing understanding of Ruthenate electronic phases.

Contribution

It demonstrates a novel method to stabilize metastable 3C BaRuO3 thin films and explores their magnetic and electronic properties, highlighting the role of Ru-O hybridization.

Findings

3C BaRuO3 thin films exhibit ferromagnetism at ~48 K.

The films show non-Fermi liquid electronic behavior.

Epitaxial stabilization enables direct comparison with other Ruthenates.

Abstract

Thin films of perovskite Ruthenates of the general formula ARuO3 (A = Ca and Sr) are versatile electrical conductors for viable oxide electronics. They are also scientifically intriguing, as they exhibit non-trivial electromagnetic ground states depending on the A-site element. Among them, realization of the cubic perovskite (3C) BaRuO3 thin film has been a challenge so far, because the 3C phase is metastable with the largest formation energy among the various polymorph phases of BaRuO3. In this study, we successfully prepared 3C BaRuO3 thin films employing epitaxial stabilization. The 3C BaRuO3 thin films show itinerant ferromagnetism with a transition temperature of ~48 K and a non-Fermi liquid phase. The epitaxial stabilization of the 3C BaRuO3 further enabled us to make a standard comparison of perovskite Ruthenates thin films, thereby establishing the importance of the Ru-O orbital hybridization in understanding the itinerant magnetic system.