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.
| Original language | English |
|---|---|
| Article number | 021018 |
| Journal | Physical Review X |
| Volume | 11 |
| Issue number | 2 |
| DOIs | |
| State | Published - Apr 2021 |
Funding
This work was financially supported by the Basic Science Center Program of NSFC (Grant No. 51788104); NSFC (Grants No. 51872155, No. U1632272, 11521404, and No. 11904196); the National Basic Research Program of China (Grant No. 2016YFA0301004); the Tsinghua University Initial Science Research Program (20203080003) and the Beijing Advanced Innovation Center for Future Chip (ICFC); and the Engineering and Physical Sciences Research Council (Grant No. EP/N016718/1). The research by S. O. was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. This research used resources of the Compute and Data Environment for Science (CADES) at the Oak Ridge National Laboratory, which is supported by the Office of Science of the U.S. Department of Energy. First-principles DFT calculations were performed at the HPC of Shanghai Jiao Tong University. P. Y. and S. S. conceived the project and designed the experiments. S. S. conducted the transport measurements and analyzed all data. Z. L. and S. S. grew the samples and performed XRD measurements. Z. T., W. L., and S. O. carried out calculations. S. S., S. O., and P. Y. wrote the manuscript, and all authors commented on the paper.
| Funders | Funder number |
|---|---|
| CADES | |
| Data Environment for Science | |
| U.S. Department of Energy | |
| Office of Science | |
| Basic Energy Sciences | |
| Division of Materials Sciences and Engineering | |
| Engineering and Physical Sciences Research Council | EP/N016718/1 |
| National Natural Science Foundation of China | 51788104, U1632272, 11521404, 51872155, 11904196 |
| Tsinghua University | 20203080003 |
| National Key Research and Development Program of China | 2016YFA0301004 |
| Beijing Innovation Center for Future Chip |