Abstract
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 metallic CaRuO3 through 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.Received 9 September 2020Revised 9 March 2021Accepted 22 March 2021DOI:https://doi.org/10.1103/PhysRevX.11.021018Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasMagnetic phase transitionsPhysical SystemsThin filmsTransition metal oxidesTechniquesDensity functional theoryDynamical mean field theoryHall barResistivity measurementsX-ray diffractionCondensed Matter, Materials & Applied Physics
Highlights
Landau Fermi-liquid (FL) theory has been a successful model for describing the low-temperature electronic properties of metals [1]
As shown in the above observations, the protonation in CaRuO3 leads to a magnetic phase transition, which is correlated with both lattice distortion and electron doping induced by intercalated protons
It is interesting to note that our previous work on proton intercalated SrRuO3 suggests the FL behavior is maintained throughout the FM to PM magnetic transition [41]
Summary
Landau Fermi-liquid (FL) theory has been a successful model for describing the low-temperature electronic properties of metals [1]. Ruthenates represent an important family of complex oxides with a rich spectrum of properties, ranging from unconventional superconductivity to ferromagnetism [12,17,18,19] Among this family, CaRuO3 has been extensively studied due to its unique nonmagnetic metallic state, as well as notable NFL behavior [16,20,21,22]. It is interesting to note that a recent study revealed a convenient method to control the magnetic state of SrRuO3 through the ionic liquid gating (ILG) induced proton intercalation (protonation) with the associated electron doping and structural deformation, which leads to a ferromagnetic to paramagnetic transition, while maintaining its robust FL behavior at low temperatures [41]. We attribute this distinct PM NFL to FM FL transition to the protonation induced band structural modulation as well as suppressed electronic correlation
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