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Magnetoresistance Oscillations of Ultrathin Pb Bridges

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Nano Research 2009年第9期2卷 671-677页

作者： Jian Wang Xucun Ma Shuaihua Ji Yun Qi Yingshuang Fu Aizi Jin Li Lu Changzhi Gu X.C.Xie Mingliang Tian Jinfeng Jia Qikun Xue Institute of physics Chinese Academy of SciencesBeijing 100190China The center for Nanoscale Science and department of physics The Pennsylvania State UniversityUniversity ParkPennsylvania 16802-6300USA department of physics Oklahoma State UniversityStillwaterOK 74078USA department of physics Tsinghua UniversityBeijing 100084China

Pb nanobridges with a thickness of less than 10 nm and a width of several hundred nm have been fabricated from single-crystalline Pb fi lms using low-temperature molecular beam epitaxy and focus ion beam microfabrication *** observed novel magnetoresistance oscillations below the superconducting transition temperature(TC)of the *** oscillations which were not seen in the crystalline Pb fi lmsmay originate from the inhomogeneity of superconductivity induced by the applied magnetic fi elds on approaching the normal state,or the degradation of fi lm quality by thermal evolution.

关键词： Pb nanobridge magnetoresistance superconductivity molecular beam epitaxy scanning tunneling microscope focus ion beam

Study of optical and dielectric properties of annealed ZnO nanoparticles in the terahertz regime

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Optoelectronics Letters 2009年第6期5卷 430-433页

作者：王明伟 Boon Kuan Woo 田震韩家广陈伟张伟力 School of Electrical and Computer Engineering Oklahoma State University Institute of Modern Optics Nankai University department of physics University of Texas at ArlingtonArlington center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering Tianjin University department of physics National University of Singapore

The frequency-dependent optical and dielectric properties of annealed ZnO nanoparticles in the range of 0.1 to 0.9 THz are studied by using terahertz time-domain spectroscopy(THz-TDS).The refractive index,power absorption and complex dielectric constants are obtained and the experimental results are well fit with a simple effective medium theory in conjunction with a pseudo-harmonic *** study reveals that annealed ZnO nanoparticles exhibit the similar phonon response characteristics to the single ZnO crystal and other ZnO nanostructures,such as tetrapods and nanowires.

关键词： ZnO纳米粒子介电性能纳米光学太赫兹退火氧化锌晶体有效介质理论声反应特征

Ultrafast structural dynamics studied by kilohertz time-resolved x-ray diffraction

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Chinese physics B 2015年第10期24卷 617-621页

作者：郭鑫江舟亚陈龙陈黎明辛建国 Peter M.Rentzepis 陈洁 School of Optoelectronics Beijing Institute of Technology Beijing National Laboratory of Condensed Matter physics Institute of PhysicsChinese Academy of Sciences Key Laboratory for Laser Plasmas(Ministry of Education) and department of physics and Astronomy Shanghai Jiao Tong University IFSA Collaborative Innovation center Shanghai Jiao Tong University Electrical & Computer Engineering Texas A & M UniversityCollege Station

Ultrashort multi-ke V x-ray pulses are generated by electron plasma produced by the irradiation of femtosecond pulses on metals. These sub-picosecond x-ray pulses have extended the field of x-ray spectroscopy into the femtosecond time domain. However, pulse-to-pulse instability and long data acquisition time restrict the application of ultrashort x-ray systems operating at low repetition rates. Here we report on the performance of a femtosecond laser plasma-induced hard x-ray source that operates at 1-k Hz repetition rate, and provides a flux of 2.0 × 10^10 photons/s of Cu Kαradiation. Using this system for time-resolved x-ray diffraction experiments, we record in real time, the transient processes and structural changes induced by the interaction of 400-nm femtosecond pulse with the surface of a 200-nm thick Au（111） single crystal.

关键词： ultrafast x-ray diffraction transient structures lattice deformation

Alice-Bob Peakon Systems

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Chinese physics Letters 2017年第6期34卷 1-4页

作者： Sen-Yue Lou Zhi-Jun Qiao center for Nonlinear Science and department of physics Ningbo University Ningbo 315211 Shanghai Key Laboratory of Trustworthy Computing East China Normal University Shanghai 200062 School of Mathematical and Statistical Science University of Texas TX 78539 USA

We study the Alice-Bob peakon system generated from an integrable peakon system using the strategy of the so- called Alice-Bob non-local KdV approach [Scientific Reports 7 （2017） 869]. Nonlocal integrable peakon equ... 详细信息

关键词： ABP Alice-Bob Peakon Systems

Nodeless superconductivity in a quasi-two-dimensional superconductor AuTe2Se(4/3)

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Chinese physics B 2018年第6期27卷 87-91页

作者： Xiao-Yu Jia Yun-Jie Yu Xu Chen Jian-Gang Guo Tian-Ping Ying Lan-Po He Xiao-Long Chen Shi-Yan Li State Key Laboratory of Surface physics Department of Physics and Laboratory of Advanced Materials Fudan UniversityBeijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of SciencesSchool of Physical Sciences University of Chinese Academy of SciencesCollaborative Innovation Center of Quantum MatterCollaborative Innovation Center of Advanced Microstructure

We performed ultra-low temperature thermal conductivity measurements on the single crystal of a new gold-based quasi-two-dimensional superconductor Au Te2Se（4/3）, which has a superconducting transition temperature Tc = 2.70 K. A negligible residual linear term κ0/T in zero magnetic field is observed, which suggests fully gapped superconducting ***, the field dependence of κ0/T is similar to that of the multi-band s-wave superconductor Ba Fe1.9 Ni0.1 As2 at low field. These results reveal multiple nodeless superconducting gaps in this interesting quasi-two-dimensional superconductor with Berezinsky–Kosterlitz–Thouless topological transition.

关键词： superconductivity thermal transport measurement gap structure two-dimensional material

Investigation of Niobium(Nb)Substitution on Structural and Superconducting Properties of(Bi,Pb)-Based Superconductors

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Advances in Materials physics and Chemistry 2017年第7期7卷 277-293页

作者： Reza Asghari Hasan Sedghi Leyla Colakerol Arsalan Hamid Naghshara department of physics Superconductivity Research CenterUrmia UniversityUrmiaIran department of Solid state and Electronic Faculty of PhysicsTabriz UniversityTabrizIran department of physics Gebze Technical UniversityGebzeTurkey

In this study, the effects of Nb substitution on the Bi-based superconducting materials have been investigated. The X-ray diffraction measurement indicated coexistence of Bi-2212, Bi-2223 phases and some impurity phases of CuO, CuNb2O6, CaNb2O6, CaCuO2, and Sr5Nb5O16. With increasing Nb content, impurity phases consistent with the Nb element appeared in the samples. Also with increasing Nb content, the Bi-2223 phase of samples gradually was decreased and in contrast, the Bi-2212 phase was increased. From the SEM, results have been seen that with increasing of Nb contents, the crystal structure of the samples was slightly changed because of the disrupted grain growth. From the electrical resistivity measurements, it has been found that with increasing of Nb contents, critical temperature decreases and the superconducting transition width (ΔT) increases. Estimated critical current density showed that Jc decreases with increasing Nb content, as expected.

关键词： H-T Superconductors Bi-2223 Phase Bi-2212 Phase Bi-2201 Phase X-Ray Diffraction

Bipolar resistive switching in Cr-doped TiO_x thin films

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Chinese physics B 2011年第9期20卷 435-438页

作者：邢钟文 A.Ignatievb National Laboratory of Solid State Microstructures and department of Materials Science and Engineering Nanjing University center for Advanced Materials and department of physics University of Houston

The electric-pulse-induced resistive switching effect is studied for Tio.s5Cro.15Ox （TCO） films grown on Ir-Si substrates by pulsed laser deposition. Such a TCO device exhibits bipolar switching behaviour with an electric-pulse- induced resistance ratio as large as about 1000% and threshold voltages smaller than 2 V. The resistive switching characteristics may be understood by resistance changes of a Schottky junction composed of a metal and an n-type semiconductor, and its nonvolatility is attributed to the movement of oxygen vacancies near the interface.

关键词： resistive random-access memory (RRAM) electrical-pulse-induced resistive (EPIR)

superconductivity, electronic phase diagram, and pressure effect in Sr_(1-x)Pr_xFBiS_2

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Science China(physics,Mechanics & Astronomy) 2019年第5期62卷 99-106页

作者： Wei You Lin Li HaiYang Yang JiaLu Wang HongYing Mao Li Zhang ChuanYing Xi Jie Cheng YongKang Luo JianHui Dai YuKe Li department of physics and Hangzhou Key Laboratory of Quantum Matter Hangzhou Normal University department of physics China Jiliang University High Magnetic Field Laboratory Chinese Academy of Sciences College of Science Center of Advanced Functional Ceramics Nanjing University of Posts and Telecommunications Wuhan National High Magnetic Field center School of physics Huazhong University of Science and Technology

Based on a combination of X-ray diffraction, electrical transports, magnetic susceptibility, specific heat, and pressure-effect measurements, we report the results of experiments on a series of BiS_2-based Sr_(1-x)Pr_xFBiS_2 superconductors with the maximum Tcof 2.7 K for x=0.5 and at ambient pressure. superconductivity appears only for 0.4≤x≤0.7 whereas the normal-state resistivity shows the semiconducting-like behaviors. The magnetic susceptibility χ(T) displays the low superconducting shielding volume fractions and C(T) shows no distinguishable anomaly near Tc, which suggests a filamentary superconductivity in the Pr-doped polycrystalline samples. By varying doping concentrations, an electronic phase diagram is established. Upon applying pressure on the optimally doped Sr_(0.5)Pr_(0.5)FBiS_2 system, Tcis abruptly enhanced, reaches 8.5 K at the critical pressure of P_c=1.5 GPa, and increases slightly to 9.7 K at 2.5 GPa. Accompanied by the enhancement of superconductivity from the low-to the high-Tc phases, the normal state undergoes a semiconductor-to-metal transition when under pressure. This scenario may be linked to enhanced overlap of the Bi-6 p and S-p orbitals, which contributes to the enhanced superconductivity above Pc. The pressuretemperature phase diagram for Sr_(0.5)Pr_(0.5)FBiS_2 is also presented.

关键词： BiS2-based superconductors superconductivity phase diagram pressure effect

Rosuvastatin‑Eluting Gold‑Nanoparticle‑Loaded Perivascular Wrap for Enhanced Arteriovenous Fistula Maturation in a Murine Model

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Advanced Fiber Materials 2023年第6期5卷 1986-2001页

作者： Carleigh Klusman Benjamin Martin Joy Vanessa D.Perez Allan John R.Barcena Marvin R.Bernardino Erin Marie D.San Valentin Jossana A.Damasco Huckie C.Del Mundo Karem A.Court Biana Godin Gino Martin Canlas Natalie Fowlkes Richard Bouchard Jizhong Cheng Steven Y.Huang Marites P.Melancon department of Interventional Radiology The University of Texas MD Anderson Cancer CenterHouston 77030USA Baylor College of Medicine Houston 77030USA College of Medicine University of the Philippines Manila1000 ManilaPhilippines department of Nanomedicine Houston Methodist Research InstituteHouston 77030USA department of Chemistry Lamar UniversityBeaumont 77710USA department of Veterinary Medicine and Surgery The University of Texas MD Anderson Cancer CenterHouston 77030USA department of Imaging physics The University of Texas MD Anderson Cancer CenterHouston 77030USA Section of Nephrology Department of MedicineSelzman Institute for Kidney HealthBaylor College of MedicineHouston 77030USA The University of texas MD Anderson Cancer center UTHealth Houston Graduate School of Biomedical Sciences Houston 77030USA

Arteriovenous fistulas(AVFs)are a vital form of AV access for patients requiring hemodialysis,but they link to overall morbidity and mortality when they fail to *** most common cause of AVF non-maturation is neointimal hyperplasia(NIH).To minimize the deleterious effects of NIH,a perivascular wrap composed of polycaprolactone(PCL),rosuvastatin(ROSU),and gold nanoparticles(AUNPs)was *** study assessed the impact of ROSU-eluting,radiopaque resorbable perivascular wraps on pathologic NIH in a chronic kidney disease(CKD)rodent model of *** PCL wraps containing AuNPs and/or ROSU were monitored for in vitro tensile strength,AuNP release,ROSU elution,and effect on cellular *** wraps were then implanted around an AVF in a CKD rodent model for in vivo ultrasound(US)and micro-computed tomography(mCT)*** specimens were collected for histological *** viability was preserved in the presence of both AuNP-and ROSU-containing *** vitro release of ROSU and AuNPs correlated with in vivo findings of decreasing radiopacity on mCT over ***-loaded wraps had higher radiopacity(1270.0-1412.0 HU at week 2)compared with other wraps(103.5-456.0 HU),which decreased over *** addition of ROSU decreased US and histologic measurements of *** reduced NIH seen with ROSU-loaded perivascular wraps suggests a synergistic effect between mechanical support and anti-hyperplasia ***,AuNP loading increased wrap ***,our results show that AuNP-and ROSU-loaded PCL wraps induce AVF maturation and suppress NIH while facilitating optimal implanted device visualization.

关键词： Arteriovenous fistula Chronic kidney disease Nanoparticles Polycaprolactone Radiopacity Rosuvastatin