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Electric and thermal transport properties of topological insulator candidate LiMgBi

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Chinese Physics B 2021年第12期30卷 544-549页

作者： Hao OuYang Qing-Xin Dong Yi-Fei Huang Jun-Sen Xiang Li-Bo Zhang chen-Sheng Li Pei-Jie Sun Zhi-An Ren gen-Fu chen Institute of Physics and Beijing National Laboratory for Condensed Matter PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China

We report the transport properties of a topological insulator candidate,*** electric resistivity of the title compound exhibits a metal-to-semiconductor-like transition at around 160 K and tends to saturation below 50 *** low temperatures,the magnetoresistance is up to~260%at 9 T and a clear weak antilocalization effect is observed in the low magnetic-field *** Hall measurement reveals that LiMgBi is a multiband system,where hole-type carriers(nh~1018 cm^(-3))play a major role in the transport ***,LiMgBi possess a large Seebeck coefficient(~440μV/K)and a moderate thermal conductivity at room temperature,which indicate that LiMgBi is a promising candidate in thermoelectric applications.

关键词： thermoelectric topological insulator crystal growth

Pressure-Dependent Point-Contact Spectroscopy of Superconducting PbTaSe2 Single Crystals

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Chinese Physics Letters 2020年第9期37卷 84-88页

作者： Hai Zi Ling-Xiao Zhao Xing-Yuan Hou Lei Shan Zhian Ren gen-Fu chen Cong Ren School of Physics and Astronomy Yunnan UniversityKunming 650500China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of ScienceBeijing 100190China

We develop an experimental tool to investigate the order parameter of superconductors by combining pointcontact spectroscopy measurement with high-pressure *** is demonstrated for the first time that planar point-contact spectroscopy measurement on noncentrosymmetric superconducting PbTaSe2 single crystals is systematically subjected to hydrostatic pressures up to 12.1 *** such a high pressure,the normal-state contact resistance is sensitive to the applied pressure,reflecting the underlying variation of contact transparency upon *** a superconducting state,the pressure dependence of the energy gap△0 and the critical temperature Tc for gap opening/closing are extracted based on a generalized Blond-Tinkham-Klapwijk *** gap ratio 2△0/kB Tc indicates a crossover from weak coupling to strong coupling in electron pairing strength upon pressure for *** experimental results show the accessibility and validity of high-pressure pointcontact spectroscopy,offering rich information about high-pressure superconductivity.

关键词： technique. coupling transparency

Effects of Temperature and Atmosphere on Pellets Reduction Swelling Index

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Journal of Iron and Steel Research International 2012年第10期19卷 7-12,19页

作者： WANG Zhao-cai, CHU Man-sheng, LIU Zheng-gen, chen Shuang-yin, XUE Xiang-xin (School of Materials and Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China) School of Materials and Metallurgy Northeastern University Shenyang Liaoning China

After taking into account the conditions of the domestic iron resources and the non-coking coal resources, the process of coal gasification-shaft furnace is an effective way to develop direct reduction iron in China. The following tasks are very critical to choose suitable process of shaft furnace and gasification, including the production of oxidized pellets with excellent comprehensive properties as well as the study of the reaction behavior and mechanism of swelling. The results showed that the oxidized pellets of using domestic magnetic iron concentrate as raw materials have favorable comprehensive properties, including higher mechanical strength both before and after reduction, faster reduction rate and lower reduction swelling index (RSI). All of these properties can meet the shaft furnace yielding requirement. When the temperature was below 1 223 K, the pellets′ RSI was lower than 20%. With increasing of the content of H2 in atmosphere, the pellets reaction rate accelerated, crushing strength enhanced and RSI decreased. The RSI dropped to 10.26% at 1 323 K in 100% H2 atmosphere, and it is up to 39.88% in 100% CO atmosphere. The iron grains mainly presented in platelike when pellets were reduced by H2, however, in CO atmosphere the iron grains were precipitated in flocculent. The whisker shape of iron grains and heating effects of reduction reaction are the major factors leading to the poor pellets strength and increase of RSI. Appropriately controlling the temperature and increasing the ratio of H2 to CO in atmosphere are good for dropping the RSI.

关键词： oxidized pellet shaft furnace direct reduction reduction swelling

Anisotropic interfacial superconductivity induced at point contacts on topological semimetal grey arsenic

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Science China(Physics,Mechanics & Astronomy) 2023年第9期66卷 94-101页

作者： Meng-Di Zhang Qing Wang Xing-Yuan Hou Ling-Xiao Zhao Zong Wang Ya-Dong Gu Fan Zhang Zhi-An Ren gen-Fu chen Ning Hao Lei Shan Beijing Academy of Quantum Information Sciences Beijing 100193China 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 Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryChinese Academy of SciencesHefei 230031China Science Island Branch of Graduate School University of Science and Technology of ChinaHefei 230026China Information Materials and Intelligent Sensing Laboratory of Anhui Province Institute of Physical Science and Information TechnologyAnhui UniversityHefei 230601China Key Laboratory of Structure and Functional Regulation of Hybrid Materials(Anhui University) Ministry of EducationHefei 230601China Center of Free Electron Laser&High Magnetic Field Anhui UniversityHefei 230601China Songshan Lake Materials Laboratory Dongguan 523808China

The origin of superconductivity observed at the point contact between the normal metal tip and the topological material remains uncertain due to the potential presence of superconducting elements or allotropes *** is imperative to seek out a topological material entirely free of superconducting impurities and induce superconductivity between it and normal tips to verify the source of the induced ***,we report the observation of superconductivity up to 9 K induced at point contacts between normal metal tips and the topological material grey arsenic,which is free of *** determined temperature dependencies of superconducting gapsΔ(T)deviate from the Bardeen-Cooper-Schriefer(BCS)superconductivity law,exhibiting abnormal ***,the highly anisotropic upper critical field H_(c2)(T)suggests the anisotropy of the projected interfacial Fermi *** tuning the junction resistance,we obtained a negative correlation between the superconducting gapΔand the efective barrier height Z,which validates the interfacial coupling strength as a key factor in the observed tip-induced *** experimental results provide guidance for the relevant theory about tip-induced superconductivity on topological materials.

关键词： tip-induced superconductivity topological material interfacial superconductivity grey As

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Design of improved compact decoupler based on adjustable capacitor for EAST-ICRF antenna

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Plasma Science and Technology 2022年第1期24卷 177-182页

作者： gen chen Yuzhou MAO Shuai YUAN Yanping ZHAO Hua YANG Xinjun ZHANG chengming QIN Yan chenG Yongsheng WANG Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People’s Republic of China

The Ion Cyclotron Radio Frequency(ICRF)heating antenna on EAST adopts a decoupling device to constrain power coupling among the radiation straps,which was discovered shortcomings such as long size,poor contact,and *** order to improve these weak points,a new type decoupler with terminal-loaded tunable capacitor is designed to replace the previous *** the capability of the tunable admittance parameters of decoupler,the withstand voltage of the capacitor is the most significant consideration for working under high ***,the theoretical analysis carefully elaborates the capacitor withstand voltage,and the detailed analytical equations and criteria for design are *** the comparative analysis of theoretical calculation and 3D simulation results,the decoupler design scheme is *** capacitor-loaded decoupler has been successfully adopted for ICRF antenna at port N on EAST,and achieved the optimization of adjacent port isolation from-22 to-58 dB at 37 MHz without plasma to restrict mutual *** new design of the decoupler has greatly improved its compactness and automatic adjustment performance,and could be good solution for the decoupling network of ICRF antennas.

关键词： decoupler ICRF adjustable capacitor EAST

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一种用于数据分布管理的模糊DR算法

浙江大学学报（工学版） 2006年第9期40卷 1521-1525页

作者：陈岭陈根才浙江大学计算机科学与技术学院浙江杭州310027

为了满足分布式交互仿真(DIS)中数据分布管理(DDM)对可扩展性和信息过滤的要求,提出一种模糊推算定位(DR)算法.该算法在多层DR算法基础上,选取系统中有用实体属性对,并确定其相应隶属函数.采用模糊一致关系从实体各属性间优先次序中得... 详细信息

为了满足分布式交互仿真(DIS)中数据分布管理(DDM)对可扩展性和信息过滤的要求,提出一种模糊推算定位(DR)算法.该算法在多层DR算法基础上,选取系统中有用实体属性对,并确定其相应隶属函数.采用模糊一致关系从实体各属性间优先次序中得到其权值.通过模糊关联度计算在信息过滤过程中综合考虑实体属性,实现对任意两实体间相关性的衡量,计算结果被用来设置DR算法阈值.仿真结果表明,视角和实体大小属性均对信息过滤过程产生影响.由该算法过滤后的运动轨迹符合人的感知特点.准确过滤率数据显示,该算法可平衡系统可扩展性要求和精度要求.

关键词：分布交互仿真数据分布管理 DR算法数据过滤模糊

Substitution effect on the superconductivity in Mo_(3-x)Re_xAl_(2)C withβ-Mn structure prepared by microwave method

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Chinese Physics B 2021年第7期30卷 498-502页

作者： Jun-Nan Sun Bin-Bin Ruan Meng-Hu Zhou Yin chen Qing-Song Yang Lei Shan Ming-Wei Ma gen-Fu chen Zhi-An Ren Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Institutes of Physical Science and Information TechnologyAnhui UniversityHefei 230601China Institute of Physics and Beijing National Laboratory for Condensed Matter Physics Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China

We report the microwave synthesis and the doping effect of Mo_(3-)xRe_xAl_(2)C(0≤x≤0.3)*** doping into Mo_(3)Al_(2)C results in a regular shrinkage of the lattice,marked by the linear decrease of lattice parameter a from6.868(1)A(for Mo_(3)Al_(2)C)to 6.846(2)A(for Mo_(2.7)Re_(0.3)Al_(2)C).Upon Re doping,T_(c)of Mo_(3-x)Re_xAl_(2)C first increases and then decreases,with the maximum T_(c)=9.14 K at the optimal doping level of x=*** report provides a convenient method to synthesize Mo_(3-)xRe_xAl_(2)C within minutes,and also marks the first Re doping study with enhanced superconductivity on the non-centrosymmetric superconductor Mo_(3)Al_(2)C.

关键词： Mo_(3-x)Re_xAl_(2)C superconductivity β-Mn structure microwave synthesis

A Novel Large Moment Antiferromagnetic Order in K_(0.8)Fe_(1.6)Se_(2) Superconductor

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Chinese Physics Letters 2011年第8期28卷 213-216页

作者： BAO Wei HUANG Qing-Zhen chen gen-Fu MAGreen WANG Du-Ming HE Jun-Bao QIU Yi-Ming Department of Physics Renmin University of ChinaBeijing 100872 NIST Center for Neutron Research National Institute of Standards and TechnologyGaithersburgMD 20899USA Department of Materials Science and Engineering University of MarylandCollege ParkMD 20742USA

The discovery of cuprate high TC superconductors has inspired the search for unconventional superconductors in magnetic materials.A successful recipe has been to suppress long−range order in a magnetic parent compound by doping or high pressure to drive the material towards a quantum critical *** report an exception to this rule in the recently discovered potassium iron *** superconducting composition is identified as the iron vacancy ordered K_(0.83)(2)Fe_(1.64)(1)Se_(2) with T_(C) above 30 K.A novel large moment 3.31μB/Fe antiferromagnetic order that conforms to the tetragonal crystal symmetry has an unprecedentedly high ordering temperature TN≈559 K for a bulk *** polarized electronic density of states is thus suspected,which would stimulate further investigation into superconductivity in a strong spin-exchange field under new circumstances.

关键词： materials superconductors ferromagnetic

Superconductivity with a Violation of Pauli Limit and Evidences for Multigap in η-Carbide Type Ti_(4)Ir_(2)O

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Chinese Physics Letters 2022年第2期39卷 64-71页

作者： Bin-Bin Ruan Meng-Hu Zhou Qing-Song Yang Ya-Dong Gu Ming-Wei Ma gen-Fu chen Zhi-An Ren Songshan Lake Materials Laboratory Dongguan 523808China Institute of Physics and Beijing National Laboratory for Condensed Matter Physics Chinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China

We report the synthesis,crystal structure,and superconductivity of Ti_(4)Ir_(2)*** title compound crystallizes in an η-carbide type structure of the space group Fd3m(No.227),with lattice parameters a=b=c=11.6194(1)*** superconducting temperature T_(c) is found to be 5.1-5.7 *** surprisingly,Ti_(4)Ir_(2)O hosts an upper critical field of 16.45 T,which is far beyond the Pauli paramagnetic *** coupled superconductivity with evidences for multigap is revealed by the measurements of heat capacity and upper critical ***-principles calculations suggest that the density of states near the Fermi level originates from the hybridization of Ti-3d and Ir-5d orbitals,and the effect of spin-orbit coupling on the Fermi surfaces is *** values of the Wilson ratio(R_(W)∼3.9),the Kadowaki-Woods ratio[A/γ^(2)∼9.0×10^(−6)µΩ·cm/(mJ·mol^(−1)·K^(−1))^(2)],and the Sommerfeld coefficient(γ=33.74 mJ·mol^(−1)·K^(−2))all suggest strong electron correlations(similar to heavy fermion systems)in Ti_(4)Ir_(2)*** violation of Pauli limit is possibly due to a combination of strong-coupled superconductivity and large spin-orbit *** these intriguing behaviors,Ti_(4)Ir_(2)O serves as a candidate for unconventional superconductor.

关键词： field Pauli superconductivity