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Weakly complex Einstein-Finsler vector bundle Dedicated to Professor Tongde Zhong for His 90th Birthday

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Science China Mathematics 2018年第6期61卷 1079-1088页

作者： liling sun Chunping Zhong College of Mathematics Taiyuan University of Technology Taiyuan 030024 China School of Mathematical Sciences Xiamen University Xiamen 361005 China

Let （E, F） be a complex Finsler vector bundle over a compact Kahler manifold （M, g） with Kahler form φ We prove that if （E, F） is a weakly complex Einstein-Finsler vector bundle in the sense of Aikou （1997）, then it is modeled on a complex Minkowski space. Consequently, a complex Einstein-Finsler vector bundle （E, F） over a compact Kahler manifold （M, g） is necessarily φ-semistable and （E,F）=（E1,F1）……（Ek,Fk）,where Fj ：= F｜Ej, and each （Ej, Fj） is modeled on a complex Minkowski space whose associated Hermitian vector bundle is a φ-stable Einstein-Hermitian vector bundle with the same factor c as （E, F）.

关键词： complex Finsler vector bundle complex Einstein-Finsler vector bundle Chern-Finsler connection mean curvature

Advanced high-pressure transport measurement system integrated with low temperature and magnetic field

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Chinese Physics B 2018年第7期27卷 91-99页

作者： Jing Guo Qi Wu liling sun Institute of Physics Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100190 China

We briefly introduce a new high-pressure transport measurement system integrated with low temperature and magnetic field that is being established as one of the user experimental stations of the Synergetic Extreme Condition User Facilities in the Huairou District of Beijing, China. To demonstrate the capabilities of the system for condensed matter research, the emergence of some pressure-induced phenomena and physics related to superconductivity found previously is also introduced, and then a perspective for such an advanced high-pressure system is presented.

关键词： high pressure low temperature magnetic field superconductivity

Transitions of amorphous-crystalline-amorphous in bulk metallic glass under HP and HT

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Chinese Science Bulletin 2002年第2期47卷 100-101页

作者： sun liling TKikegawa WANG Wenkui Laboratory of Extreme Condition Physics Institute of PhysicsChinese Academy of SciencesBeijing 100080China Photon Factory Institute for Materials Structure ScienceHigh EnergyAccelerator Organization College of Material Science and Chemical Engineering Yanshan UniversityQinhuangdao 066004China

In-situ SR-XRD measurements revealed that the crystallization process in Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk metallic glass is significantly different from that in tradi-tional glasses. Subsequent heating at 10 GPa converts the sample from amorphous phase into the metastable fcc phase and then leads to the fcc phase back to the amorphous phase, indicating that there exists ’reversible’ phase transition phe-nomena in the material under high pressure and high tem-perature.

关键词：上口

Effects of gravity field on glass forming ability in ZrTiCuNiBe alloy

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Chinese Science Bulletin 2001年第24期46卷 2048-2050页

作者： LI Gong sun liling WANG Wenkui Institute of Physics Center for Condensed Matter PhysicsChinese Academy of SciencesBeijing 100080China Department of Materials Science and Engineering Yanshan UniversityQinhuangdao 066004China

The solidification and glass forming ability of Zr41Ti14Cu12.5Ni10Be22.5 bulk glassy forming alloy is investigated by Bridgman unidirectional solidification at different growth velocities under different gravity field orientations. Large differences in glass formation, undercooling and crystallization morphology on different solidification conditions have been found and discussed from the point of view of gravity induced convection. The results are useful for understanding the nucleation and growth in the melt and glass formation mechanism in the alloy.

关键词： bulk metallic glass gravity field solidification glass forming ability.

Microstructure of Pd_(77.5)Au_6Si_(16.5) Alloy Droplet Solidified in a Drop Tube Process

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Journal of Materials Science & Technology 1996年第5期12卷 385-388页

作者： liling sun Qi WU Liwei sun and Wenkui WANG (Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China) Institute of Physics Chinese Academy of Sciences Beijing 100080 China

The microstructure development of Pd77.5Au6Si16.5 alloy droplet solidified in a drop tube process was studied. It was found that two distinct microstructures, i.e. (Pd,Au)3Si primary phase and Pd+(Pd,Au)3Si eutectic can be obtained when the droplet diameter is within the range between 2.3~0.4 mm. The morpologies of the (Pd,Au)3Si developed from dendrite trunk-like with single branching only into dendrite cluster-like with ternary branching with the decrease of the droplet diameter. When the droplet diameter is about 0.25 mm, the primary phase (Pd,Au)3Si almost disappears and the microstructure mainly shows Pd+(Pd,Au)3Si eutectic. The morphology of the eutectic transforms from fiber-like to plate-like with the decrease of the droplet diameter in the range between 2.3-0.25 mm. When the droplet diameter is about 0.19 mm, the microstructure is only the single phase of Pd solid solution

关键词： Microstructure of Pd Au6Si Alloy Droplet Solidified in a Drop Tube Process

Valence electronic structure of tantalum carbide and nitride

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Science China(Physics,Mechanics & Astronomy) 2007年第6期50卷 737-741页

作者： FAN ChangZeng sun liling WEI ZunJie MA MingZhen LIU RiPing ZENG SongYan WANG WenKui Department of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China National Laboratory for Superconductivity Institute of PhysicsChinese Academy of SciencesBeijing 100080China National Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQin-huangdao 066004China

The valence electronic structures of tantalum carbide (TaC) and tantalum nitride (TaN) are studied by using the empirical electronic theory (EET). The results reveal that the bonds of these compounds have covalent,metallic and ionic characters. For a quantitative analysis of the relative strength of these components,their ionicities have been calculated by implanting the results of EET to the PVL model. It has been found that the ionicity of tantalum carbide is smaller than that of tantalum nitride. The EET results also reveal that the covalent electronic number of the strongest bond in the former is larger than that of the latter. All these suggest that the covalent bond of TaC is stronger than that of TaN,which coincides to that de-duced from the first-principles method.

关键词： TaC TaN valence electronic structure ionicity

Crossover from Two-to Three-dimensional Superconducting States in Bismuth-based Cuprate Superconductor

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Bulletin of the Chinese Academy of Sciences 2019年第4期33卷 239-240页

作者： sun liling Institute of Physics CAS

To decipher the mechanism of high temperature superconductivity(SC),it is important to know how the superconducting pairing emerges from the unusual normal states of cuprate superconductors,including pseudogap,anomalous Fermi liquid and strange metal(SM).A long-standing issue under debate is how the superconducting pairing is formed and condensed in the SM phase because the superconducting transition temperature is the highest in this phase.

关键词： Superconducting States Bismuth-based Cuprate Superconductor Crossover from Two

Discovery of Quantum Phase Transition in Pressurized Cuprate Superconductors

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Bulletin of the Chinese Academy of Sciences 2022年第1期36卷 45-46页

作者： sun liling Institute of Physics Chinese Academy of Sciences

The discovery of cuprate high-temperature superconductors in 1986 impacted science and technology considerably and continues to fascinate the communities of condensed matter physics and material sciences because they host the highest ambient-pressure superconducting transition temperature and unconventional electronic ***,the underlying mechanism of the superconductivity is yet an unsolved *** for the universal links between the superconducting state and its neighboring quantum states is believed to be an effective approach to elucidate the high-temperature superconducting mechanism.

关键词： mechanism. Transition neighboring

Quantum Phases of SrCu2(BO3)2 from High-Pressure Thermodynamics

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Bulletin of the Chinese Academy of Sciences 2020年第2期34卷 104-105页

作者： sun liling Anders Sandvik Institute of Physics CAS Boston University

In recent years,theoretical proposals for exotic states in quantum magnets are developing very rapidly,but many of these intriguing quantum phases and transitions have been difficult to realize *** class of such states is the valence bond solid,in which spins entangle locally and form symmetry-breaking singlet *** of a state with four-spin singlets were recently detected in the two-dimensional(2D)quantum magnet SrCu2(BO3)2 under high pressure.

关键词： quantum singlet symmetry