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A selective control of volatile and non-volatile superconductivity in an insulating copper oxide via ionic liquid gating
journal contributionposted on 14.09.2020 by Xinjian Wei, Hao-Bo Li, Qinghua Zhang, Dong Li, Mingyang Qin, Li Xu, Wei Hu, Qing Huan, Li Yu, Jun Miao, Jie Yuan, Beiyi Zhu, Anna Kusmartseva, Feodor Kusmartsev, Alejandro V. Silhanek, Tao Xiang, Weiqiang Yu, Yuan Lin, Lin Gu, Pu Yu, Qihong Chen, Kui Jin
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© 2020 Science China Press Manipulating the superconducting states of high transition temperature (high-Tc) cuprate superconductors in an efficient and reliable way is of great importance for their applications in next-generation electronics. Here, employing ionic liquid gating, a selective control of volatile and non-volatile superconductivity is achieved in pristine insulating Pr2CuO4±δ (PCO) films, based on two distinct mechanisms. Firstly, with positive electric fields, the film can be reversibly switched between superconducting and non-superconducting states, attributed to the carrier doping effect. Secondly, the film becomes more resistive by applying negative bias voltage up to − 4 V, but strikingly, a non-volatile superconductivity is achieved once the gate voltage is removed. Such phenomenon represents a distinctive route of manipulating superconductivity in PCO, resulting from the doping healing of oxygen vacancies in copper-oxygen planes as unravelled by high-resolution scanning transmission electron microscope and in situ X-ray diffraction experiments. The effective manipulation of volatile/non-volatile superconductivity in the same parent cuprate brings more functionalities to superconducting electronics, as well as supplies flexible samples for investigating the nature of quantum phase transitions in high-Tc superconductors.
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National Key Basic Research Program of China (2015CB921000, 2016YFA0300301, 2017YFA0302902, 2017YFA0303003 and 2018YFB0704102)
National Natural Science Foundation of China (11674374 and 11834016)
Strategic Priority Research Program of Chinese Academy of Sciences (XDB25000000)
Key Research Program of Frontier Sciences, CAS (QYZDB-SSW-SLH008 and QYZDY-SSWSLH001)