Journal Article

Emergent Ferromagnetism with Fermi-Liquid Behavior in Proton Intercalated CaRuO3

Yu, Pu, Tian, Zijun, Shen, Shengchun, Okamoto, Satoshi, Luo, Weidong, Li, Zhuolu

2021

Overview

The evolution between Fermi-liquid and non-Fermi-liquid states in correlated electron systems has been a central subject in condensed matter physics because of the coupled intriguing magnetic and electronic states. An effective pathway to explore the nature of non-Fermi-liquid behavior is to approach its phase boundary. Here we report a crossover from non-Fermi-liquid to Fermi-liquid state in metallicCaRuO3through ionic liquid gating induced protonation with electric field. This electronic transition subsequently triggers a reversible magnetic transition with the emergence of an exotic ferromagnetic state from this paramagnetic compound. Our theoretical analysis reveals that hydrogen incorporation plays a critical role in both the electronic and magnetic phase transitions via structural distortion and electron doping. These observations not only help understand the correlated magnetic and electronic transitions in perovskite ruthenate systems, but also provide novel pathways to design electronic phases in correlated materials.

• Publisher: American Physical Society,American Physical Society (APS)
• Subject: Atomic structure / Calcium / Condensed matter physics / CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY / Correlation / density functional theory / Destabilization / dynamical mean field theory / Electric fields / Electrolysis / Electron states / Electron transitions / Electrons / Fermions / Ferromagnetic phases / Ferromagnetism / Hall bar / High temperature / In situ measurement / Ionic liquids / Magnetic permeability / magnetic phase transitions / Magnetic properties / Phase transitions / Protons / resistivity measurements / Stability / Superconductivity / Temperature dependence / Thin films / transition-metal oxides / x-ray diffraction