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Frontiers of physics 2016年第5期11卷 79-89页

作者： Jiangping Hu Jing Yuan Institute of Physics Chinese Academy of Sciences Beijing 100190 China Department of Physics Purdue University West Lafayette IN 47907 USA Collaborative Innovation Center of Quantum Matter Beijing 100871 China

Based on the assumption that the superconducting state belongs to a single irreducible representation of lattice symmetry, we propose that the pairing symmetry in all measured iron-based superconductors is generally consistent with the A1g s-wave. Robust s-wave pairing throughout the different families of iron-based superconductors at different doping regions signals two fundamental principles behind high-To superconducting mechanisms：（i） the correspondence principle： the short-range magnetic-exchange interactions and the Fermi surfaces act collaboratively to achieve high-Tc superconductivity and determine pairing symmetries; （ii） the magnetic-selection pairing rule： supercon- ductivity is only induced by the magnetic-exchange couplings from the super-exchange mechanism through cation-anion-cation chemical bonding. These principles explain why unconventional high- Tc superconductivity appears to be such a rare but robust phenomena, with its strict requirements regarding the electronic environment. The results will help us to identify new electronic structures that can support high-Tc superconductivity.

关键词： iron-based superconductors cuprates unconventional superconductivity high-temperature superconductors

Development of metal-organic deposition-derived second-generation high-temperature superconductor tapes and artificial flux pinning

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Advances in Manufacturing 2023年第3期11卷 523-540页

作者： Dong-Xu Wang Jing Chen Di-Fan Zhou Chuan-Bing Cai Shanghai Key Laboratory of high temperature superconductors Shanghai Frontiers Science Center of Quantum and Superconducting Matter StatesDepartment of PhysicsShanghai UniversityShanghai 200444People's Republic of China Shanghai Creative Superconductor Technologies Co.Ltd. Shanghai 201401People's Republic of China

The second-generation high-temperature superconductor tape(2G-HTS,also known as a coated conductor)based on REBaCuO(REBa_(2)Cu_(3)O_(7-δ))exhibits high current density and potential cost-effective price/performance,compared with conventional superconducting *** commercial 2G-HTS tapes,more than a dozen cable vendors had been manufacturing REBCO cables,such as the latest kilometer-class REBCO cable,which was incorporated into a civil grid on December 2021,as part of the recordbreaking 35-kV-voltage superconductor cable demonstration project in downtown *** paper describes the development of HTS-coated conductors,then outlines the various technological routes for their preparation,reviews the artificial flux pinning of coated conductors,and finally summarizes the technological breakthroughs,the latest research advances,and provides an outlook on their application prospects.

关键词： high-temperature superconductors RE123 superconductor tapes Chemical solution deposition Flux pinning

Microscopic evidence for the intra-unit-cell electronic nematicity inside the pseudogap phase in YBa_(2)Cu_(4)O_(8)

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Science China(Physics,Mechanics & Astronomy) 2021年第3期64卷 99-104页

作者： Wen Wang Jun Luo ChunGuang Wang Jie Yang Yasuharu Kodama Rui Zhou Guo-Qing Zheng Institute of Physics Chinese Academy of SciencesBeijing National Laboratory for Condensed Matter PhysicsBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China National Institute of Advanced Industrial Science and Technology(AlST) Tsukuba 305-8568Japan Songs han Lake Materials Laboratory Dongguan 523808China Department of Physics Okayama UniversityOkayama 700-8530Japan

Understanding the nature of the mysterious pseudogap phenomenon is one of the most important issues associated with cuprate high-T_(c) ***,we report 17O nuclear magnetic resonance(NMR) studies on two planar oxygen sites in stoichio?metric cuprate YBa_(2)Cu_(4)O_(8) to investigate the symmetry breaking inside the pseudogap *** observe that the Knight shifts of the two oxygen sites are identical at high temperatures but different below T_(nem) ~185 K,which is close to the pseudogap temperature T^(*).Our result provides a microscopic evidence for intra-unit-cell electronic *** difference in quadrupole resonance frequency between the two oxygen sites is unchanged below T_(nem),which suggests that the observed nematicity does not directly stem from the local charge density ***,a short-range charge density wave(CDW) order is observed below T=150 *** additional broadening in the 17O-NMR spectra because of this CDW order is determined to be inequivalent for the two oxygen sites,which is similar to that observed in case of *** results suggest a possible connection between nematicity,CDW order,and pseudogap.

关键词： high-temperature superconductors nuclear magnetic resonance nematic order pseudogap

First and Second Sound Modes in a Uniform Fermi Gas

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Chinese Physics Letters 2009年第7期26卷 25-28页

作者：黄备兵完绍龙 Institute for Theoretical Physics and Department of Modern Physics University of Science and Technology of China Hefei 230026

First and second sound modes in a uniform fermionic atom gas with Feshbaeh resonance are investigated in the frame of a two-fluid model at finite temperature. All thermodynamic quantities axe calculated for a given thermodynamic potential. The analytical results for thermodynamic quantities and sound velocities in BCS and BEC limits are obtained. The numerical results show that there exists a continuous interpolation for sound velocities of the first and second sound modes at fixed T/Tc between BCS and BEC limits. The existence of the second sound mode indicates the existence of superfluidity.

关键词： high-temperature superconductors BCS-BEC CROSSOVER HELIUM II

Critical Scaling of Extended Power Law I - V Isotherms near Vortex Glass Transition

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Chinese Physics Letters 2006年第12期23卷 3349-3351页

作者：胡翔贺丽宁振华陈凯旋尹澜陆果徐晓林郭建栋王福仁李传义尹道乐 School of Physics Peking University Beijing 100871

In view of the question about the vortex glass theory of the freezing of disordered vortex matter raised by recent experimental observations, we reinvestigate the critical scaling of high Tc superconductors. It is found that the dc current-voltage characteristic of mixed state superconductors has a general form of extended power law which is based on the Ginzburg-Landau （GL） functional in the similar way as the vortex glass theory. Isotherms simulated from this nonlinear equation fit the experimental I- V data of Strachan et al. [Phys. Rev. Left. 87（2001） 067007]. The puzzling question of the derivative plot for the I - V curves and the controversy surrounding the values of critical exponents are discussed.

关键词： high-temperature superconductors T-C superconductors AC SUSCEPTIBILITY VORTICES PHASE DISORDER

Influence of Gauge Fluctuation on Electron Pairing Order Parameter and Correlation Functions of a Two-Dimensional System

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Chinese Physics Letters 2006年第11期23卷 3076-3079页

作者：林明喜祁胜文刘玉良 College of Physics and Electronics Shandong Normal University Jinan 250014 Department of Physics Dezhou University Dezhou 253023 Department of Physics Renmin University of China Beijing 100872

Based on a two-dimensional electron system with pure gauge field, we demonstrate that the long range order of the electron pairing order parameter can be destroyed by the gauge fluctuation for both s-wave and d-wave symmetric Cooper pair parameters, even if the pure gauge field mediates attractive interaction between the spinup and spin-down electrons, while the signal of the Meissner effect is observable. This model can be used to explain the recent experimental data of the high Tc cuprate superconductors observed.

关键词： high-temperature superconductors high-TC SUPERCONDUCTIVITY VALENCE BONDSTATE C superconductors PHASE FERMIONS MODEL GAP

Anisotropic evolution of energy gap in Bi2212 superconductor

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Frontiers of physics 2016年第5期11卷 91-96页

作者： A. P. Durajski Institute of Physics Czestochowa University of Technology Ave. Arrnii Krajowej 19 42-200 Czestochowa Poland

We present a systematic analysis of the energy gap in underdoped Bi2212 superconductor as a function of temperature and hole doping level. Within the framework of the theoretical model containing the electron-phonon and electron-electron-phonon pairing mechanism, we reproduced the measurement results of modern ARPES experiments with very high accuracy. We showed that the energy-gap am- plitude is very weakly dependent on the temperature but clearly dependent on the level of doping. The evidence for a non-zero energy gap above the critical temperature, referred to as a pseudogap, was also obtained.

关键词： high-temperature superconductors anisotropy energy gap Bi2212

Recent progress on high-temperature superconducting filters

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Superconductivity 2022年第2期2卷 28-38页

作者： Chi Zhang Wei Xie Chunguang Li Jinhao Dai Yuefeng Yuan Runbo Jiang Xu Wang Jia Wang Yun Wu Liang Sun Yusheng He Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100190China Southwest China Research Institute of Electronic Equipment Chengdu 610036China Henan University of Science and Technology Luoyang 471000China Songshan Lake Materials Laboratory Dongguan 523808China

Since the discovery of high temperature superconducting(HTS)materials in 1987,the performance of microwave filters such as insertion loss,selectivity,and out-band rejection has been significantly improved by utilizing HTS ***,HTS filters have been widely used in wireless communications,space exploration,satellite communications,and several other *** filters with a special performance,such as wideband,dual-band or multiband,frequency tunable,and high power-handling capability have been designed and fabricated in recent years to meet the increasing requirements of practical applications and to further extend the application *** paper reviews the various types of above-mentioned HTS filters as well as the developments of novel design methodologies.

关键词： high-temperature superconductors Microwave filters Wideband Dual-band Frequency-tunable high power handling

On the Path to high-temperature Josephson Multi-Junction Devices

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Electromagnetic Science 2024年第3期2卷 71-78页

作者： Xu Wang Fucong Chen Zefeng Lin Shibing Tian Chunguang Li Victor Kornev Nikolay Kolotinskiy Institute of Physics Chinese Academy of SciencesBeijing 100190China Faculty of Physics Lomonosov Moscow State UniversityMoscow 119991Russia

We report our progress in the high-temperature superconductor(HTS)Josephson junction fabrication process founded on utilizing a focused helium ion beam damaging technique and discuss the expected device performance attainable with the HTS multi-junction device *** the achievable high value of characteristic voltage V_(C)=I_(C)R_(N)of Josephson junctions and the ability to design a large number of arbitrary located Josephson junctions allow narrowing the existing gap in design abilities for lowtemperature superconductor(LTS)and HTS circuits even with using a single YBa_(2)Cu_(3)O_(7-x) film layer.A one-layer topology of active electrically small antenna is suggested and its voltage response characteristics are considered.

关键词： Josephson junctions high-temperature superconductors YBa_(2)Cu_(3)O_(7-x)(YBCO) Focused helium ion beam fabrication technique Josephson multi-junction devices Superconducting quantum interference device Active electrically small antenna