Reversible manipulation of the magnetic state in SrRuO3 through electric-field controlled proton evolution

Zhuolu Li, Shengchun Shen, Zijun Tian, Kyle Hwangbo, Meng Wang, Yujia Wang, F. Michael Bartram, Liqun He, Yingjie Lyu, Yongqi Dong, Gang Wan, Haobo Li, Nianpeng Lu, Jiadong Zang, Hua Zhou, Elke Arenholz, Qing He, Luyi Yang (), Weidong Luo () and Pu Yu ()
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Zhuolu Li: Tsinghua University
Shengchun Shen: Tsinghua University
Zijun Tian: Shanghai Jiao Tong University
Kyle Hwangbo: University of Toronto
Meng Wang: Tsinghua University
Yujia Wang: Tsinghua University
F. Michael Bartram: University of Toronto
Liqun He: University of Toronto
Yingjie Lyu: Tsinghua University
Yongqi Dong: Argonne National Lab
Gang Wan: Argonne National Lab
Haobo Li: Tsinghua University
Nianpeng Lu: Tsinghua University
Jiadong Zang: University of New Hampshire
Hua Zhou: Argonne National Lab
Elke Arenholz: Lawrence Berkeley National Laboratory
Qing He: Durham University
Luyi Yang: Tsinghua University
Weidong Luo: Shanghai Jiao Tong University
Pu Yu: Tsinghua University

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Ionic substitution forms an essential pathway to manipulate the structural phase, carrier density and crystalline symmetry of materials via ion-electron-lattice coupling, leading to a rich spectrum of electronic states in strongly correlated systems. Using the ferromagnetic metal SrRuO3 as a model system, we demonstrate an efficient and reversible control of both structural and electronic phase transformations through the electric-field controlled proton evolution with ionic liquid gating. The insertion of protons results in a large structural expansion and increased carrier density, leading to an exotic ferromagnetic to paramagnetic phase transition. Importantly, we reveal a novel protonated compound of HSrRuO3 with paramagnetic metallic as ground state. We observe a topological Hall effect at the boundary of the phase transition due to the proton concentration gradient across the film-depth. We envision that electric-field controlled protonation opens up a pathway to explore novel electronic states and material functionalities in protonated material systems.

Date: 2020
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DOI: 10.1038/s41467-019-13999-1

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