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Metal-organic decomposition growth of thin film metastable perovskite nickelates with kinetically improved quantum transitions

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International Journal of Minerals,Metallurgy and Materials 2023年第12期30卷 2441-2450页

作者： Haiyan Li Yuzhao Wang Fanqi Meng Wei Mao Xingzhong Cao Yi Bian Hao Zhang Yong Jiang Nuofu Chen Jikun Chen Beijing Advanced Innovation Center for Materials Genome Engineering School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China School of Renewable Energy North China Electric Power UniversityBeijing 102206China School of Materials Science and Engineering Peking UniversityBeijing 100871China School of Engineering The University of Tokyo2-11-16 YayoiBunkyo-kuTokyo 113-0032Japan Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China

The multiple quantum transitions within d-band correlation oxides such as rare-earth nickelates(RENiO_(3))triggered by critical temperatures and/or hydrogenation opened up a new paradigm for correlated electronics applications,*** electric field sensor,bio-sensor,and neuron synapse logical ***,these applications are obstructed by the present ineffectiveness in the thin film growth of the metastable RENiO_(3)with flexibly adjustable rare-earth compositions and electronic ***,we demonstrate a metal-organic decompositions(MOD)approach that can effectively grow metastable RENiO_(3)covering a large variety of the rare-earth composition without introducing any vacuum *** the previous chemical growths for RENiO_(3)relying on strict interfacial coherency that limit the film thickness,the MOD growth using reactive isooctanoate percussors is tolerant to lattice defects and therefore achieves comparable film thickness to vacuum *** indicated by positron annihilation spectroscopy,the RENiO_(3)grown by MOD exhibit large amount of lattice defects that improves their hydrogen incorporation amount and electron transfers,as demonstrated by the resonant nuclear reaction analysis and near edge X-ray absorption fine structure *** effectively enlarges the magnitude in the resistance regulations in particular for RENiO_(3)with lighter RE,shedding a light on the extrinsic regulation of the hydrogen induced quantum transitions for correlated oxides semiconductors kinetically via defect engineering.

关键词： metal-insulator transition rare earth nickelates lattice defects hydrogen incorporation metal-organic decomposition

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Frequency regulation in alternation-current transports across metal to insulator transitions of thin film correlated perovskite nickelates

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Journal of Materials Science & Technology 2023年第17期148卷 235-241页

作者： Haifan Li Fanqi Meng Yi Bian Xuanchi Zhou Jiaou Wang Xiaoguang Xu Yong Jiang Nuofu Chen Jikun Chen School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China School of Renewable Energy North China Electric Power UniversityBeijing 102206China

Although the metal to insulator transition(MIT)observed in d-band correlated metal oxides enables promising applications(e.g.,correlated logical devices and Mottronic devices),its present recognition is mainly limited on the direct current(DC)electrical *** to date,the MIT from the perspective of alternation current(AC)transport and its potential electronic applications remains yet ***,we demonstrate the frequency(f_(AC))dependence in the impedance(Z=Z’+iZ″)of typical MIT materials,such as thin film rare-earth nickelates(Re NiO_(3)),across the critical MIT temperature(T_(MIT)).Apart from the abrupt change in the impedance modulus(|Z|)across the critical temperature(T_(MIT))similar to the DC transport,the MIT also triggers non-continuous variation in the impedance phase(θ),and this enables the f_(AC)-regulations in the Z’-T tendencies(Z’=|Z|cosθ).At the critical f_(AC) range(e.g.,104-106 Hz),the con-versing variations in|Z|-T and cosθ-T across T_(MIT) result in non-monotonic delta-shape Z’-T tendency in Sm_(x) Nd_(1-x) NiO_(3),the full width half maximum of which is effectively narrowed compared to the situation with the absence of *** imparting lower or higher f_(AC) elevate the domination in|Z|-T and cosθ-T,respectively,but also enables abrupt Z’-T tendencies across T_(MIT) showing negative temperature coefficient of resistance(NTCR)or positive temperature coefficient of resistance(PTCR).By introducing f_(AC) as a new freedom,the MIT behavior can be more comprehensively regulated electronically,and this extends the vision in exploring the new electronic applications based on the correlated MIT materials from the AC perspective.

关键词： Metal to insulator transition rare earth nickelates Electrical transportations Impedance Perovskite oxide Electronic correlation

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