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Electronic transport evolution across the successive structural transitions in Ni_(50-x)Fe_xTi_(50) shape memory alloys

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Chinese Physics B 2024年第7期33卷 529-536页

作者：何萍杨金颖任秋飒王彬彬吴光恒刘恩克 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 School of Materials Science and Engineering University of Science and Technology of BeijingBeijing 100083China

TiNi-based shape memory alloys have been extensively investigated due to their significant applications,but a comprehensive understanding of the evolution of electronic structure and electrical transport in a system with martensitic transformations(MT) is still lacking.In this work,we focused on the electronic transport behavior of three phases in Ni_(50-x)Fe_xTi_(50)across the MT.A phase diagram of Ni_(50-x)Fe_xTi_(50) was established based on x-ray diffraction,calorimetric,magnetic,and electrical measurements.To reveal the driving force of MT,phonon softening was revealed using first-principles calculations.Notably,the transverse and longitudinal transport behavior changed significantly across the phase transition,which can be attributed to the reconstruction of electronic structures.This work promotes the understanding of phase transitions and demonstrates the sensitivity of electron transport to phase transition.

关键词： martensitic transformation electronic behavior transport properties first-principles calculations

transport properties of boron nanotubes investigated by ab initio calculation

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Chinese Physics B 2009年第6期18卷 2502-2507页

作者：郭伟胡亦斌张余洋杜世萱高鸿钧 Nanoscale Physics and Devices Laboratory Institute of PhysicsChinese Academy of Sciences

We investigate atomic and electronic structures of boron nanotubes （BNTs） by using the density functional theory （DFT）. The transport properties of BNTs with different diameters and chiralities are studied by the Keldysh nonequilibrium Green function （NEGF） method. It is found that the cohesive energies and conductances of BNTs decrease as their diameters decrease. It is more difficult to form （N, 0） tubes than （M, M） tubes when the diameters of the two kinds of tubes are comparable. However, the （N, 0） tubes have a higher conductance than the （M, M） tubes. When the BNTs are connected to gold electrodes, the coupling between the BNTs and the electrodes will affect the transport properties of tubes significantly.

关键词： nonequilibrium Green function transport properties boron nanotubes

transport properties and anomalous fatigue effect of Ag/Bi_(0.9)La_(0.1)FeO_3/La_(0.7)Sr_(0.3)MnO_3 heterostructures

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Chinese Physics B 2014年第9期23卷 455-460页

作者：高荣礼符春林蔡苇陈刚邓小玲杨怀文孙继荣沈保根 School of Metallurgy and Materials Engineering Chongqing University of Science and Technology Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences

The transport properties and fatigue effect of Ag/Bi0.9La0.lFeO3/La0.7Sr0.3MnO3 heterostructures are described. By examining the I-V curves, an anomalous fatigue effect was found and its influences on resistive states were studied. I-V curves combined with C-f spectra were used to directly analyze the transport properties and fatigue effect. Compared to the first I-V cycle state, this structure shows more than one order increase of resistance after 100 cycles of ＂I-V curve training＂. The redistribution of oxygen vacancies in the depletion layer of Ag/Bi0.9La0.lFeO3 is believed to be responsible for the different resistance mechanisms and tenfold magnitude drop in resistance. The resistive switching is understood to be caused by electric field-induced carrier trapping and detrapping, which changes the depletion layer thickness at the Ag/Bi0.9La0.lFeO3 interface.

关键词： transport properties fatigue effect switching heterostructure

transport properties of zigzag graphene nanoribbons adsorbed with single iron atom

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Chinese Physics B 2015年第11期24卷 428-433页

作者：杨玉娥肖杨颜晓红戴昌杰 Department of Applied Physics Nanjing University of Aeronautics and Astronautics

We have performed density-functional calculations of the transport properties of the zigzag graphene nanoribbon （ZGNR） adsorbed with a single iron atom. Two adsorption configurations are considered, i.e., iron adsorbed on the edge and on the interior of the nanoribbon. The results show that the transport features of the two configurations are similar. However, the transport properties are modified due to the scattering effects induced by coupling of the ZGNR band states to the localized 3d-orbital state of the iron atom. More importantly, one can find that several dips appear in the transmission curve, which is closely related to the above mentioned coupling. We expect that our results will have potential applications in graphene-based spintronic devices,

关键词： graphene nanoribbon transport properties iron adatom

transport properties of doped Bi2Se3 and Bi2Te3 topological insulators and heterostructures

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Chinese Physics B 2018年第10期27卷 107-115页

作者：王振华高翾张志东 Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Department of Physics Case Western Reserve University Cleveland Ohio 44106 USA

In this review article, the recent experimental and theoretical research progress in Bi2Se3-and Bi2Te3-based topological insulators is presented, with a focus on the transport properties and modulation of the transport properties by doping with nonmagnetic and magnetic elements. The electrical transport properties are discussed for a few different types of topological insulator heterostructures, such as heterostructures formed by Bi2Se3-and Bi2Te3-based binary/ternary/quaternary compounds and superconductors, nonmagnetic and magnetic metals, or semiconductors.

关键词： transport properties interfaces heterostructures nanostructures doping magnetoresistance

transport properties of Zintl phase Yb_(1-x)Ca_xCd_2Sb_2 at low temperature

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Journal of Rare Earths 2010年第3期28卷 403-406页

作者：操齐高汤美波马光陈昊鸿杨昕昕赵景泰 Key Laboratory of Transparent Opto-Functional Inorganic Materials of Chinese Academy of Sciences Shanghai Institute of CeramicsChinese Academy of Sciences Graduate School of Chinese Academy of Sciences Northwest Institute for Non-Ferrous Metal Research

We investigated the transport properties of isoelectronic substitution of Yb by Ca for Zintl phase YbCd2Sb2 below 300 K.The p-type Yb1-xCaxCd2Sb2(0.2≤x≤0.8) samples were synthesized via a solid-state reaction followed by suitable cooling,annealing,grinding,and spark plasma sintering(SPS) densification processes.For samples with x=0.2,0.4,0.5,0.6,0.8,the electrical conductivity,Seebeck coefficient,thermal conductivity,heat capacity and Hall effect measurements were carried out in the temperature range from 1...

关键词： YbCd2Sb2 rare earths Zintl phase transport properties thermoelectric properties

transport properties in a One—Dimensional Chain with Randomly Side—Coupled Impurities

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Chinese Physics Letters 2002年第12期19卷 1850-1852页

作者：胡冬生张桂平等 DepartmentofPhysics NanjingUniverityNanjing210093

We investigate the transport properties of a one-dimensional (1D) chain with randomly side-coupled impurities. By using the transfer matrix technique, we present numerical results of the transmission coefficient as a function of the electron energy. It is found that an extended state will be shown in such a random 1D system if the impurities are side-coupled to the chain with not only the nearest-neighbour bonds but also the next-nearest-neighbour bonds. We present an analytical expression for the energy of this extended state, which is determined by the strength of the nearest and next-nearest couplings between the impurities and the chain. The obtained results can be used to explain the transport properties of DNA chains and other quasi-1D organic structures.

关键词： transport properties

transport properties of Rare Earth Manganese Oxide La_(0.67)Ca_(0.33)Mn_(1-x)Fe_xO_3

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Journal of Rare Earths 2004年第5期22卷 663-667页

作者：崔玉建葛洪良贾广强韩雁冰余森江张金仓 Department of Physics China Institute of Metrology Hangzhou 310018 China Department of Physics Shanghai University Shanghai 200436 China

The transport properties were studied for rare earth manganese oxide La_(0.67)Ca_(0.33)Mn_(1-x)Fe_xO_3 (x=0～0.3) systems. It is found that with increasing Fe^(3+)-doping content x, the resistance increases and the insulator-metal transition temperature (T_(IM)) shifts to lower temperature. If the doping content is small, the transport properties manifest metallic characteristics in the temperature range of TT_(IM). Such a behavior may be attributed to the Fe^(3+)-doping and possible Mn ions scattering to electrons. The Fe^(3+) doping may lead to the formation of Fe^(3+)-O^(2-)-Mn^(4+) channels, which could terminate the double exchange Mn^(3+)-O^(2-)-Mn^(4+) channels. The antiferromagnetic clusters of Fe ions may induce the Mn ions to scetter to the electrons.

关键词： metal material transport properties Fe doping La_(2/3)Ca_(1/3)MnO_3 rare earths

transport properties of Tl_(2)Ba_(2)CaCu_(2)O_(8) microbridges on a low-angle step substrate

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Chinese Physics B 2021年第6期30卷 149-153页

作者：赵生辉田王昊梁雪连何泽王培季鲁何明王华兵 College of Electronic Information and Optical Engineering Nankai UniversityTianjin 300350China Research Institute of Superconductor Electronics Nanjing UniversityNanjing 210093China Beijing Institute of Radio Measurement Beijing 100854China Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin Tianjin 300350China

Tl-based superconducting devices have been drawn much attention for their high transition temperature(T_c), which allow the high temperature superconductors(HTS) devices to operate at temperature near 100 K. The realization of Tlbased devices will promote the research and application of HTS devices. In this work, we present transport properties of Tl_(2) Ba_(2) CaCu_(2) O_(8)(Tl-2212) microbridges across a low-angle step on LaAlO_(3)(LAO) substrate. We experimentally demonstrate intrinsic Josephson effects(IJEs) in Tl-2212 films by tailoring the geometry, i.e., reducing the width of the microbridges. In the case of a 1 μm width microbridge, in addition to the observation of voltage branches and remarkable hysteresis on the current–voltage(I–V) characteristics, the temperature dependence of differential resistance shows a finite resistance above 60 K when the bias current is below the critical current. For comparison, the wider microbridges are also investigated, exhibiting a highly critical current but do not showing obvious IJEs.

关键词： high temperature superconductors Tl-2212 intrinsic Josephson effects transport properties