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journal article·2017-10-24Open access

The Mechanism of Electrolyte Gating on High-Tc Cuprates: The Role of Oxygen Migration and Electrostatics

Lingchao Zhang, Shengwei Zeng, Xinmao Yin, Teguh Citra Asmara, Ping Yang, Kun Han, Yu Cao, Wenxiong Zhou, Dongyang Wan, Chi Sin Tang, Andrivo Rusydi, Ariando, Thirumalai Venkatesan

ACS Nano· Volume 11· Issue 10
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Source abstract

Abstract

Electrolyte gating is widely used to induce large carrier density modulation on solid surfaces to explore various properties. Most of past works have attributed the charge modulation to electrostatic field effect. However, some recent reports have argued that the electrolyte gating effect in VO 2, TiO 2, and SrTiO 3 originated from field-induced oxygen vacancy formation. This gives rise to a controversy about the gating mechanism, and it is therefore vital to reveal the relationship between the role of electrolyte gating and the intrinsic properties of materials. Here, we report entirely different mechanisms of electrolyte gating on two high- T c cuprates, NdBa 2 Cu 3 O 7−δ (NBCO) and Pr 2– x Ce x CuO 4 (PCCO), with different crystal structures. We show that field-induced oxygen vacancy formation in CuO chains of NBCO plays the dominant role, while it is mainly an electrostatic field effect in the case of PCCO. The possible reason is that NBCO has mobile oxygen in CuO chains, while PCCO does not. Our study helps clarify the controversy relating to the mechanism of electrolyte gating, leading to a better understanding of the role of oxygen electro migration which is very material specific.
Source: openalex_inverted_index · Quality: baseline

Research context

Energy storage

OpenAlex topics: Electronic and Structural Properties of Oxides · Semiconductor materials and devices · Magnetic and transport properties of perovskites and related materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

NUSNNI-NanoCore, National University of Singapore, Singapore 117411

Department of Physics, National University of Singapore, Singapore 117551

Singapore Synchrotron Light Source (SSLS), National University of Singapore, 5 Research Link, Singapore 117603

SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, China 518060

NUS Graduate School for Integrative Sciences and Engineering (NGS), National University of Singapore, Singapore 117456

Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117576

Department of Materials Science and Engineering, National University of Singapore, Singapore 117575

Funding

National Research Foundation Singapore · Faculty of Science, National University of Singapore · National University of Singapore

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