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Manipulating high-temperature superconductivity by oxygen doping in Bi2Sr2CaCu2O8+δ thin flakes

National Science Review 2022年第10期9卷 112-119页

作者： Bin Lei Donghui Ma Shihao Liu Zeliang Sun Mengzhu Shi Weizhuang Zhuo Fanghang Yu Genda Gu Zhenyu Wang Xianhui Chen Key Laboratory of Strongly-Coupled Quantum Matter Physics Chinese Academy of Sciences and Department of Physics University of Science and Technology of China CAS Center for Excellence in Quantum Information and Quantum Physics Department of Condensed Matter Physics and Materials Science Brookhaven National Laboratory CAS Center for Excellence in Superconducting Electronics (CENSE) Collaborative Innovation Center of Advanced Microstructures Nanjing University

Harnessing the fascinating properties of correlated oxides requires precise control of their carrier density.Compared to other methods,oxygen doping provides an effective and more direct way to tune the electronic properties of correlated oxides.Although several approaches,such as thermal annealing and oxygen migration,have been introduced to change the oxygen content,a continuous and reversible solution that can be integrated with modern electronic technology is much in demand.Here,we report a novel ionic field-effect transistor using solid Gd-doped CeO2as the gate dielectric,which shows a remarkable carrier-density-tuning ability via electric-field-controlled oxygen concentration at room temperature.In Bi2Sr2CaCu2O8+δ(Bi-2212) thin flakes,we achieve a reversible superconductor-insulator transition by driving oxygen ions in and out of the samples with electric fields,and map out the phase diagram all the way from the insulating regime to the over-doped superconducting regime by continuously changing the oxygen doping level.Scaling analysis indicates that the reversible superconductor-insulator transition for the Bi-2212 thin flakes follows the theoretical description of a two-dimensional quantum phase transition.Our work provides a route for realizing electric-field control of phase transition in correlated oxides.Moreover,the configuration of this type of transistor makes heterostructure/interface engineering possible,thus having the potential to serve as the next-generation all-solid-state field-effect transistor.

关键词： high-temperature superconductivity oxygen doping electric field effect all-solid-state field effect transistor superconductor–insulator transition

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Theoretical understanding of correlation between magnetic phase transition and the superconducting dome in high-Tc cuprates

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Science China(Physics,Mechanics & Astronomy) 2024年第2期67卷 167-173页

作者： Chen Zhang Cai-Xin Zhang Su-Huai Wei Haiqing Lin Hui-Xiong Deng State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Beijing Computational Science Research Center Beijing 100193China

Many issues concerning the origin of high-temperature superconductivity(HTS)are still under debate.For example,how the magnetic order varies with doping and its relationship with the superconducting temperature(Tc);and why Tcalways peaks near the quantum critical point.In this paper,taking hole-doped La_(2)CuO_(4)as a classical example,we employ the first-principles band structure and total energy calculations with Monte Carlo simulations to explore how the symmetry-breaking magnetic ground state evolves with hole doping and the origin of a dome-shaped superconductivity region in the phase diagram.We demonstrate that the local antiferromagnetic order and doping play key roles in determining the electron-phonon coupling,thus Tc.Initially,the La_(2)CuO_(4)possesses a checkerboard local antiferromagnetic ground state.As the hole doping increases,Tcincreases with the enhanced electron-phonon coupling strength.But as the doping increases further,the strength of the antiferromagnetic interaction weakens and spin fluctuation increases.At the critical doping level,a magnetic phase transition occurs that reduces the local antiferromagnetism-assisted electron-phonon coupling,thus diminishing the Tc.The superconductivity disappears in the heavily overdoped region when the ferromagnetic order dominates.These observations could account for why cuprates have a dome-shaped superconductivity region in the phase diagram.Our study,thus,contributes to a fundamental understanding of the correlation between doping,local magnetic order,and superconductivity of HTS.

关键词： high-temperature superconductivity antiferromagnetic order electron-phonon coupling doping effect cuprates

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Fermion dynamical symmetry and strongly-correlated electrons:A comprehensive model of high-temperature superconductivity

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Frontiers of physics 2020年第4期15卷 35-99页

作者： Mike Guidry Yang Sun Lian-Ao Wu Cheng-Li Wu Department of Physics and Astronomy Universilty of TenesseeKnorilleTN 37996USA School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China IKERBASQUE Basque Foundation for Science48011 BilbaoSpainand Department of Theoretical Physics and History of ScienceBasque Country University(EHU/UPV)Post Office Bor 64448080 BilbaoSpain Department of Physics Chung-Yuan Christian UniversityChungliTaiwan 320China

We review application of the SU(4)model of strongly-correlated electrons to cuprate and iron-based superconductors.A minimal self-consistent generalization of BCS theory to incorporate antiferromag-netism on an equal footing with pairing and strong Coulomb repulsion is found to account system-atically for the major features of high-temperature superconductivity,with microscopic details of the parent compounds entering only parametrically.This provides a systematic procedure to separate es-sential from peripheral,suggesting that many features exhibited by the high-Te data set are of interest in their own right but are not central to the superconducting mechanism.More generally,we propose that the surprisingly broad range of conventional and unconventional superconducting and superfluid behavior observed across many fields of physics results from the systemnatic appearance of similar al-gebraic structures for the emergent ffoctive Harmiltonians,even though the microscopic Harmiltonians of the corresponding parent states may differ radically from each other.

关键词： strongly-correlated electrons SU(4)model fermian dynamical symmetry high-temperature superconductivity

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Boosted on-chip energy storage with transistors

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National Science Review 2022年第10期9卷 56-57页

作者： Tongchao Liu Khalil Amine Chemical Sciences and Engineering Division Argonne National Laboratory Materials Science and Engineering Stanford University

On-chip energy-storage devices play an important role in powering wireless environmental sensors and microelectrome chanical systems [1,2].Starting from the 1980s,on-chip energy-storage devices,including microbatteries and super capacitors,have been applied to power the real-time clock on a chip [3].These tiny batteries/supercapacitors enable the real-time clock to keep working when the electronics are off.In this way,electronic devices can be restarted with a valid time.With the development of electronic devices,signal processing and communication have become much faster,while also requiring more powerful energy-storage devices to drive them [4-6].

关键词： high-temperature superconductivity oxygen doping electric field effect all-solid-state field effect transistor superconductor–insulator transition

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Applications of the conformal transformation method instudies of composed superconducting systems

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Frontiers of physics 2016年第6期11卷 109-127页

作者： Mateusz Krzyzosiak Ryszard Gonczarek Adam Gonczarek Lucjan Jacak University of Michigan-Shanghai Jiao Tong University Joint Institute 800 Dongchuan Rd. Shanghai 200240 China Faculty of Fundamental Problems of Technology Wroctaw University of Technology Wybrzeze Wyspianskiego 27 50-370 Wroctaw Poland Faculty of Computer Science and Management Wroctaw University of Technology Wybrzeze Wyspianskiego 27 50-370 Wroc~aw Poland

A framework for analytical studies of superconducting systems is presented and illustrated. The formalism, based on the conformal transformation of momentum space, allows one to study the effects of both the dispersion relation and the structure of the pairing interaction in two-dimensional anisotropic high-T c superconductors. In this method, the number of employed degrees of freedom coincides with the dimension of the momentum space, which is different compared to that in the standard Van Hove scenario with a single degree of freedom. A new function, the kernel of the density of states, is defined and its relation to the standard density of states is explained. The versatility of the method is illustrated by analyzing coexistence and competition between spin-singlet and spin-triplet order parameters in superconducting systems with a tight-binding-type dispersion relation and an anisotropic pairing potential. Phase diagrams of stable superconducting states in the coordinates ?· (the ratio of hopping parameters) and n (the carrier concentration) are presented and discussed. Moreover, the role of attractive and repulsive on-site interactions for the stability of the s-wave order parameter is explained.

关键词： high-temperature superconductivity conformal transformation pairing symmetry critical temperature 74.20.Rp 74.25.Dw 74.62.Yb 74.20.Fg

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Oxygen Isotope Effects on T_(c) Related to Polaronic superconductivity in Underdoped Cuprates

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Journal of Modern Physics 2014年第6期5卷 473-476页

作者： B.I.Kochelaev K.A.Müller A.Shengelaya Institute of Physics Kazan Federal UniversityKremlevskaya 18KazanRussia Physik-Institut der Universitat Zürich WinterthurerstrZürichSwitzerland Department of Physics Tbilisi State UniversityChavchavadzeTbilisiGeorgia

The planar oxygen isotope effect on Tc observed in copper oxide superconductors is remarkable in that it increases from near nil at optimal doping to a value twice that derived from BCS theory in the underdoped region. This behavior is quantitatively followed by a formula proposed by Kresin and Wolf in 1994 for polarons along the c-axis. Herein it is revisited in a more transparent way, and it is pointed out that the heterogeneity of pairing is relevant and has to be taken into account to explain the unusual planar isotope effects on Tc in underdoped cuprates.

关键词： Cuprates high-temperature superconductivity Polarons Isotope Effect

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2T高温超导Bi-2223带材磁体

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低温物理学报 2003年第S1期25卷 214-219页

作者：汪京荣滕鑫康李成山胡立发张平祥冯勇周廉西北有色金属研究院西北有色金属研究院西安710016

过带材Ic 及其弯曲性能测试 ,进行磁体设计 ,采用先处理后绕制 (R&W)的工艺 ,制得中心磁场达 2T的高温超导Bi 2 2 2 3带材饼状线圈磁体 .该磁体在液氮 (77K)下通电流 2 2 .4A ,中心磁场达 0 .2 5T;在液氦下可通电流 1 70A ,中心磁场达 2... 详细信息

过带材Ic 及其弯曲性能测试 ,进行磁体设计 ,采用先处理后绕制 (R&W)的工艺 ,制得中心磁场达 2T的高温超导Bi 2 2 2 3带材饼状线圈磁体 .该磁体在液氮 (77K)下通电流 2 2 .4A ,中心磁场达 0 .2 5T;在液氦下可通电流 1 70A ,中心磁场达 2 .0T (4.2K) ,为液氮下的 8倍 ,表明所采用的工艺 ,对制作中小规模高温超导Bi 2 2 2 3带材饼状线圈磁体 ,是合适的 .

关键词： high-temperature superconductivity Bi-2223 tapes magnet technology

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基于约瑟夫森结的MMIC前端接收器的设计与制造

基于约瑟夫森结的MMIC前端接收器的设计与制造

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作者：切尔曼（Iurii Cherukhin）哈尔滨工业大学

学位级别：硕士

Today, the mm Wave, microwave and RF technology is more pervasive than it has ever been. The development of these technologies is striding hand in hand with the developing of new materials trough the simple conductors and dielectrics, semiconductors, superconductors to metamaterials. Previously, the development of the materials has given n-times performance improvement for the microwave circuits, however, in case of the superconducting materials it gives improvements in several orders of magnitude in the key performance parameters.The materials properties of the superconductors and suitable substrates have been analyzed in this project. Based on the analysis of high-temperature superconducting material necessary parameters have been derived, which allowed to design a monolithic microwave integrated circuit of a front-end receiver. The MMIC receiver consists a coplanar waveguide log-periodic dipole antenna, transition from the coplanar waveguide to a microstrip, a microstrip resonator, the Josephson junction, ultrawideband bandpass filter, and feeding system. The high-temperature superconducting MMIC provides a down conversion from 37.5 GHz to 7.5 GHz with the bandwidth more than 7 GHz.The simulation results have been obtained in Sonnet? Software by applying the two-fluid model. The major components of HTS MMIC are:? Antenna. The obvious improvement for superconducting antennas is in the radiation efficiency of small antennas and superdirectional arrays. Antennas which are around the size of one wavelength are normally fairly efficient and superconductors cannot greatly help. Speaking of transmitting antennas, the power handling capabilities increases significantly with applying of the high-temperature superconductors. For the receiving antennas it important to have noise as low as possible. The simulation results of log-periodic dipole antenna show a good performance(VSWR is lower than 2) in the selected bandwidth 30 – 50 GHz. The coplanar waveguide realization of the log-periodic dipole antenna excludes necessit

关键词： The Josephson junction MMIC front-end receiver high-temperature superconductivity Tl-2212 Tl2Ba2Ca Cu2O8

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