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A selective control of volatile and non-volatile superconductivity in an insulating copper oxide via ionic liquid gating

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Science Bulletin 2020年第19期65卷 1607-1613,M0003页

作者： 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 Feo V.Kusmartsev Alejandro V.Silhanek Tao Xiang Weiqiang Yu Yuan Lin Lin Gu Pu Yu Qihong Chen Kui Jin Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing 100084China State Key Laboratory for Advanced Metals and Materials School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China Songshan Lake Materials Laboratory Dongguan 523808China Department of Physics Loughborough UniversityLE113TU LoughboroughUK Experimental Physics of Nanostructured Materials Q-MATCESAMUniversitéde LiègeB-4000 Sart TilmanBelgium Department of Physics Renmin University of ChinaBeijing 100872China State Key Laboratory of Electronic Thin Films and Integrated Devices&Center for Information in Medicine University of Electronic Science and Technology of ChinaChengdu 610054China

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 ***,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 ***,with positive electric fields,the film can be reversibly switched between superconducting and non-superconducting states,attributed to the carrier doping ***,the film becomes more resistive by applying negative bias voltage up to-4V,but strikingly,a non-volatile superconductivity is achieved once the gate voltage is *** 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 *** 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-Tcsuperconductors.

关键词： Parent cuprate Electron-doped copper oxide Superconducting thin film ionic liquid gating Volatile and non-volatile superconductivity

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Investigation of helicity-dependent photocurrent of surface states in(Bi_(0.7)Sb_(0.3))_(2)Te_(3)nanoplate

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Chinese Physics B 2024年第5期33卷 573-578页

作者：喻钦俞金玲陈涌海赖云锋程树英何珂 School of Advanced Manufacturing Fuzhou UniversityQuanzhou 362251China Institute of Micro/Nano Devices and Solar Cells School of Physics and Information EngineeringFuzhou UniversityFuzhou 350108China Key Laboratory of Semiconductor Materials Science Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering Changzhou UniversityChangzhou 213164China Department of Physics State Key Laboratory of Low Dimensional Quantum PhysicsTsinghua UniversityBeijing 100084China

Helicity-dependent photocurrent(HDPC)of the surface states in a high-quality topological insulator(Bi_(0.7)Sb_(0.3))_(2)Te_(3)nanoplate grown by chemical vapor deposition(CVD)is *** investigating the angle-dependent HDPC,it is found that the HDPC is mainly contributed by the circular photogalvanic effect(CPGE)current when the incident plane is perpendicular to the connection of the two contacts,whereas the circular photon drag effect(CPDE)dominates the HDPC when the incident plane is parallel to the connection of the two *** addition,the CPGE of the(Bi_(0.7)Sb_(0.3))_(2)Te_(3)nanoplate is regulated by temperature,light power,excitation wavelength,the source–drain and ionic liquid top-gate voltages,and the regulation mechanisms are *** is demonstrated that(Bi_(0.7)Sb_(0.3))_(2)Te_(3)nanoplates may provide a good platform for novel opto-spintronics devices.

关键词： (Bi_(0.7)Sb_(0.3))_(2)Te_(3)nanoplate helicity-dependent photocurrent circular photogalvanic effect ionic liquid gating

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Stability of superconducting Nd_(0.8)Sr_(0.2)NiO_(2) thin films

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Science China(Physics,Mechanics & Astronomy) 2022年第6期65卷 123-130页

作者： Xiang Ding Shengchun Shen Huaqian Leng Minghui Xu Yan Zhao Junrui Zhao Xuelei Sui Xiaoqiang Wu Haiyan Xiao Xiaotao Zu Bing Huang Huiqian Luo Pu Yu Liang Qiao School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China Department of Physics Tsinghua UniversityBeijing 100084China Beijing Computational Science Research Center Beijing 100193China School of Mechanical Engineering Chengdu UniversityChengdu 610106China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

The discovery of superconducting states in the nickelate thin film with infinite-layer structure has paved a new way for studying unconventional *** far,research in this field is still very limited due to difficulties in sample *** we report the successful preparation of the superconducting state of Nd_(0.8)Sr_(0.2)NiO_(2)thin film(T_(c)=8.0-11.1 K)and study the stability of such films in the ambient environment,water,and under electrochemical *** work demonstrates that the superconducting state of Nd_(0.8)Sr_(0.2)NiO_(2)is remarkably stable,which can last for at least 47-day continuous exposure to air at 20°C and 35%relative *** also show that the superconductivity disappears after being immersed in de-ionized water at room temperature for 5 ***,it can also survive under ionic liquid gating conditions with an applied voltage of about 4 V,which is even more stable than conventional perovskite complex oxides.

关键词： nickelate superconductor stability ionic liquid gating

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Reversible control of magnetic and transport properties of NdNiO_(3-δ)epitaxial films

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Journal of Rare Earths 2021年第3期39卷 317-322,I0003页

作者： Huihui Ji Guowei Zhou Jun Zhang Xiaojiao Wang Xiaohong Xu Key Laboratory of Magnetic Molecules and Magnetic Information Materials Ministry of EducationSchool of Chemistry and Materials ScienceShanxi Normal UniversityLinfen 041004China Research Institute of Materials Science of Shanxi Normal University&Collaborative Innovation Center for Shanxi Advanced Permanent Magnetic Materials and Technology Linfen 041004China

Rare-earth nickelates possess intrinsic charge order,orbital order,and electron-lattice coupling,which make them very interesting for applications in oxide-based electronic *** this study,we grew NdNiO_(3-δ)(NNO) films with oxygen pressures changing from 27 to 10^(-5) *** decreasing oxygen pressure,the antiferromagnetic state of the NNO film becomes a ferromagnetic state,and the resistance increases *** to combined X-ray absorption spectro scopy and X-ray linear dichroism measurements,the ratio of Ni^(2+)-ions increases with decreasing oxygen-pressure,and the preferred orbital occupation changes from x^(2)-y^(2) to 3 z^(2)-r^(2).In addition,using the ionic-liquid gating method to control the migration of oxygen vacancies,both the magnetic properties and resistance of NNO films can be modulated *** oxygen vacancy induces a valence in the Ni ions and the orbital occupation changes,which alters the magnetic properties and the electronic transport in these NNO *** study describes a novel tunable method for electronic devices that use NdNiO_(3-δ) films,and opens new doors for future improvements and functionalities.

关键词： NdNiO3 films Oxygen vacancy Valence state Orbital occupation ionic liquid gating Rare earths

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Emergent quantum phenomena in atomically engineered iridate heterostructures

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Fundamental Research 2023年第3期3卷 313-321页

作者： Lin Hao Di Yi Meng Wang Jian Liu Pu Yu Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryHFIPSChinese Academy of SciencesHefeiAnhui 230031China State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China RIKEN Center for Emergent Matter Science(CEMS) Wako 351-0198Japan Department of Physics and Astronomy University of TennesseeKnoxvilleTennessee 37996USA State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing 100084China Frontier Science Center for Quantum Information Beijing 100084China

Over the last few years,researches in iridates have developed into an exciting field with the discovery of numerous emergent phenomena,interesting physics,and intriguing *** the studies,iridate-based artificial structures play a crucial role owing to their extreme flexibility and tunability in lattice symmetry,chemical composition,and crystal *** this article,we present an overview of the recent progress regarding iridate-based artificial *** first explicitly introduce several essential concepts in ***,we illustrate important findings on representative SrIrO_(3)/SrTiO_(3) superlattices,heterostructures comprised of SrIrO3 and magnetic oxides,and their response to external electric-field ***,we comment on existing problems and promising future directions in this exciting field.

关键词： Iridate Spin-orbit coupling Many-body physics Artificial crystalline structure Magnetism Magnetotransport property ionic liquid gating

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