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Enhanced Self-pumped Phase Conjugation from 45°-Cut Rh:BaTiO_(3)

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Chinese physics Letters 1999年第4期16卷 269-270页

作者： ZHANG Dao-fan YANG Chang-xi NIU Xiao-juan LIU Hong-bin WU Xing ZHU Yong institute of physics and center for condensed matter physics Chinese Academy of SciencesBeijing 100080

High efficiency self-pumped phase conjugation(SPPC)has been obtained in 45°-cut Rh:BaTiO3crystal using a Ti:Al_(2)O_(3)*** SPPC reflectivities as high as 90%are measured in a region of incident angle between 45° and 67°.The SPPC buildup time is 5-7 times as fast as 0°-cut Rh:BaTiO_(3)*** as a function of wavelength is also *** reflectivity remains essentially constant at 9±3% from 708 to *** photorefractive performance of this special 45°-cut Rh:BaTiO_(3) is characterized and compared with the 0°-cut Rh:BaTiO_(3).

关键词： crystal. essentially reflectivity

Analysis of Step Etching on SrTiO_(3) Substrates for the Step-Edge YBCO Josephson Junctions

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Chinese physics Letters 2001年第1期18卷 106-108页

作者： CHEN Geng-Hua WANG Jing ZHAO Shi-Ping HAN Bing XU Feng-Zhi YANG Qian-Sheng institute of physics and center for condensed matter physics Chinese Academy of SciencesBeijing 100080

A way to determine some important etching parameters in the step fabrication for highTc step-edge Josephson junctions is described based on an analysis of the dynamics of the etching *** optimum thickness of the etch mask is defined with negligible recession of the mask edge during the *** this condition,the equilibrium angle of the steps etched on the SrTiO_(3)(STO)substrate with an Nb mask has been calculated to be about 76°.With optimized mask thickness,its sharp sidewall and straight edge,high-quality steps on STO substrates with step height from 200-300 nm and step angle above 70°are *** junctions and dc-SQUIDs with high reproducibility and less parameter scatter are obtained on the step substrates.

关键词： process. Josephson steps

Geometric Phase in Path Integral and Quantisation Rule

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Chinese physics Letters 1999年第4期16卷 241-243页

作者： WANG Zheng-chuan LI Bo-zang institute of physics and center for condensed matter physics Chinese Academy of SciencesBeijing 100080

A description of geometric phase in terms of path integral formalism is *** is proved that this adiabatic phase can appear in the propagator or Green function of an adiabatic *** the semiclassical approximation,following the Green function expression of the electronic density of states,the corresponding generalized Bohr-Sommerfeld quantisation rule can thus be *** is shown that this rule has been corrected by the geometric phase.

关键词： phase. adiabatic geometric

Antiferromagnetic Order and Possible Quantum Spin Liquid in Kagome Antiferromagnet LuCu_(3)(OH)_(6)Br_(2)[Br_(x)(OH)_(1-x)]

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Chinese physics Letters 2025年第2期42卷 255-259页

作者： Zezhong Li Lankun Han Yili Sun Shanshan Zhang Zhenyuan Zeng Shiliang Li 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

Recent studies on the kagome lattice YCu_(3)(OH)_(6+x)X_(3-x)(X=Cl,Br)have provided promising evidence for the existence of Dirac quantum spin *** this study,we synthesized a new compound,LuCu_(3)(OH)_(6)Br_(2)[Br_(x)(OH)_(1-x)],which has two types of structures with two different space groups,P3m1 and *** type-Ⅰ sample with a space group of P3m1 had undistorted Cu^(2+)kagome planes and orders magnetically below approximately 1.5 *** type-Ⅱ sample had a larger unit cell with a space group of R3 and distorted kagome *** magnetic ordering was observed,and the low-temperature specific heat behaved like a Dirac quantum spin liquid,including a quadratic temperature dependence at zero field and an additional linear𝑇term under magnetic *** comparing the structures with those of YCu_(3)(OH)_(6+x)X_(3-x)(X=Cl,Br),we show that the quantum spin liquid ground state may have a deep connection with the𝐽J■-J-J′Heisenberg model in the kagome lattice.

关键词： distorted x) quantum

Transmittance and Refractive Index of the Lanthanum Strontium Aluminium Tantalum Oxide Crystal

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Chinese physics Letters 2001年第2期18卷 278-279页

作者： HU Bo-Qing WANG Xiao-Ming ZHOU Tang ZHAO Zong-Yuan WU Xing CHEN Xiao-Long institute of physics and center for condensed matter physics Chinese Academy of SciencesBeijing 100080

The lanthanum strontium aluminium tantalum oxide(LSAT)crystal is grown by means of a floating or pulling *** optical transmittance,refractive indices in visible and near-infrared areas and its dispersion curve are ***... 详细信息

关键词： refractive lanthanum Crystal

Geometric Phase Approach to Dielectricity Based on the Born-Oppenheimer Approximation

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Chinese physics Letters 1999年第10期16卷 703-705页

作者： WANG Zheng-chuan LI Bo-zang institute of physics and center for condensed matter physics Chinese Academy of SciencesBeijing 100080

Macroscopic polarization differences in crystal dielectrics have been accurately treated by certain authors using the geometric phase ***,in their treatments the explicit meaning of the slowly varying parameters was not *** this paper we restudy the problem under the Born-Oppenheimer *** turns out that the coordinates of nuclei in the system can be taken as the slowly varying *** addition,our treatment is no longer restricted to the case of null electric held.

关键词： Approximation coordinates turns

Unraveling the reaction mechanism of high reversible capacity CuP_(2)/C anode with native oxidation PO_(x) component for sodium-ion batteries

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Chinese Chemical Letters 2025年第1期36卷 574-578页

作者： Huixin Chen Chen Zhao Hongjun Yue Guiming Zhong Xiang Han Liang Yin Ding Chen State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China CAS key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China College of Materials Science and Engineering Co-Innovation Center of Efficient Processing and Utilization of Forest ResourcesNanjing Forestry UniversityNanjing 210037China Laboratory of Advanced Spectro-electrochemistry and Li-ion Batteries Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China institute of physics Chinese Academy of SciencesBeijing 100190China Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Institute of Rare Earth MaterialsHaixi institutesChinese Academy of SciencesXiamen 361021China

Phosphorus-based anode is a promising anode for sodium-ion batteries(SIBs)due to its high specific capacity,however,suffers from poor electronic conductivity and unfavorable electrochemical *** metals such as copper(Cu)into phosphorus has been demonstrated to not only improve the electronic conductivity but also accommodate the volume change during cycling,yet the underline sodiation mechanism is not ***,take a copper phosphide and reduced graphene oxide(CuP_(2)/C)composite as an example,which delivers a high reversible capacity of>900 mAh/***,it is revealed that the native oxidation PO_(x)components of the CuP_(2)/C composite show higher electrochemical reversibility than the bulk Cu P_(2),based on a quantitative analysis of high-resolution solid-state^(31)P NMR,ex-situ XPS and synchrotron X-ray diffraction characterization *** sodiation products Na_(3)PO_(4) and Na_(4)P_(2)O_(7) derived from PO_(x) could react with Na-P alloys and regenerate to PO_(x) during charge process,which probably accounts for the high reversible capacity of the Cu P_(2)/C *** findings also illustrate that the phosphorus transforms into nanocrystalline Na_(3)P and Na_(x)P alloys,which laterally shows crystallization-amorphization evolution process during cycling.

关键词： CuP_(2)/C composite POx component Reaction mechanism Solid-state NMR Sodium-ion batteries

A-site ordered quadruple perovskite oxides AA'3B4O12

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Chinese physics B 2016年第7期25卷 62-74页

作者：龙有文 Beijing National Laboratory for condensed matter physics Institute of Physics Chinese Academy of Sciences Collaborative Innovation center of Quantum matter

The A-site ordered perovskite oxides with chemical formula AA’BOdisplay many intriguing physical properties due to the introduction of transition metals at both A and B sites. Here, research on the recently discovered intermetallic charge transfer occurring between A-site Cu and B-site Fe ions in La CuFeOand its analogues is reviewed, along with work on the magnetoelectric multiferroicity observed in La MnCrOwith cubic perovskite structure. The Cu–Fe intermetallic charge transfer(LaCuFeO→ LaCuFeO) leads to a first-order isostructural phase transition accompanied by drastic variations in magnetism and electrical transport properties. The La MnCrOis a novel spindriven multiferroic system with strong magnetoelectric coupling effects. The compound is the first example of cubic perovskite multiferroics to be found. It opens up a new arena for studying unexpected multiferroic mechanisms.

关键词： high-pressure synthesis A-site ordered perovskite charge transfer multiferroicity

Ultrafast multiplex CARS investigation of vibrational characteristics in chloroform and PMMA

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Chinese physics B 2009年第4期18卷 1463-1468页

作者：王英惠彭亚晶何兴宋云飞杨延强 center for condensed matter Science and Technology Department of Physics Harbin Institute of Technology

This paper demonstrates the femtosecond time-resolved coherent anti-Stokes Raman scattering by using folded BOXCARS geometry where an ultrashort broadband coherent white light continuum was used as Stokes pulse, and carries out the non-contact detection at long distance, The CARS signal is so easy to be detected that it can be seen even by nude eye. The C-H bonds of chloroform or PMMA were detected and the vibration modes belonging to the side chain and the main chain in PMMA were also compared. Their vibrational characteristics involved decay process and quantum beating were discussed. This modified CARS experimental technique could make up the deficiency of traditional CARS technique.

关键词： femtosecond ultrafast CARS vibrational characteristics