Emergent electric field control of phase transformation in oxide superlattices

Di Yi (), Yujia Wang, Olaf M. J. van ʼt Erve, Liubin Xu, Hongtao Yuan, Michael J. Veit, Purnima P. Balakrishnan, Yongseong Choi, Alpha T. N’Diaye, Padraic Shafer, Elke Arenholz, Alexander Grutter, Haixuan Xu (), Pu Yu (), Berend T. Jonker and Yuri Suzuki
Additional contact information
Di Yi: Stanford University
Yujia Wang: Tsinghua University
Olaf M. J. van ʼt Erve: Materials Science and Technology Division, US Naval Research Laboratory
Liubin Xu: University of Tennessee
Hongtao Yuan: Nanjing University
Michael J. Veit: Stanford University
Purnima P. Balakrishnan: Stanford University
Yongseong Choi: Advanced Photon Source, Argonne National Laboratory
Alpha T. N’Diaye: Advanced Light Source, Lawrence Berkeley National Laboratory
Padraic Shafer: Advanced Light Source, Lawrence Berkeley National Laboratory
Elke Arenholz: Advanced Light Source, Lawrence Berkeley National Laboratory
Alexander Grutter: NIST Center for Neutron Research, National Institute of Standards and Technology
Haixuan Xu: University of Tennessee
Pu Yu: Tsinghua University
Berend T. Jonker: Materials Science and Technology Division, US Naval Research Laboratory
Yuri Suzuki: Stanford University

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract Electric fields can transform materials with respect to their structure and properties, enabling various applications ranging from batteries to spintronics. Recently electrolytic gating, which can generate large electric fields and voltage-driven ion transfer, has been identified as a powerful means to achieve electric-field-controlled phase transformations. The class of transition metal oxides provide many potential candidates that present a strong response under electrolytic gating. However, very few show a reversible structural transformation at room-temperature. Here, we report the realization of a digitally synthesized transition metal oxide that shows a reversible, electric-field-controlled transformation between distinct crystalline phases at room-temperature. In superlattices comprised of alternating one-unit-cell of SrIrO3 and La0.2Sr0.8MnO3, we find a reversible phase transformation with a 7% lattice change and dramatic modulation in chemical, electronic, magnetic and optical properties, mediated by the reversible transfer of oxygen and hydrogen ions. Strikingly, this phase transformation is absent in the constituent oxides, solid solutions and larger period superlattices. Our findings open up this class of materials for voltage-controlled functionality.

Date: 2020
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DOI: 10.1038/s41467-020-14631-3

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