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Negative differential resistance and quantum oscillations in FeSb_2 with embedded antimony

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Chinese Physics B 2019年第3期28卷 321-327页

作者： Fangdong Tang Qianheng Du cedomir petrovic Wei Zhang Mingquan He Liyuan Zhang Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-nano Devices Renmin University of China Department of Physics Southern University of Science and Technologyand Shenzhen Institute for Quantum Science and Engineering Condensed Matter Physics and Materials Science Department Brookhaven National Laboratory Department of Materials Science and Chemical Engineering Stony Brook University Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials College of PhysicsChongqing University

We present a systematical study on single crystalline FeSb2 using electrical transport and magnetic torque measurements at low temperatures. Nonlinear magnetic field dependence of Hall resistivity demonstrates a multi-carrier transport instinct of the electronic transport. Current-controlled negative differential resistance(CC-NDR) observed in currentvoltage characteristics below ～ 7 K is closely associated with the intrinsic transition ～ 5 K of FeSb2, which is, however,mediated by extrinsic current-induced Joule heating effect. The antimony crystallized in a preferred orientation within the FeSb2 lattice in the high-temperature synthesis process leaves its fingerprint in the de Haas-Van Alphen(dHvA) oscillations, and results in the regular angular dependence of the oscillating frequencies. Nevertheless, possible existence of intrinsic non-trivial states cannot be completely ruled out. Our findings call for further theoretical and experimental studies to explore novel physics on flux-free grown FeSb_2 crystals.

关键词： two-carrier transport negative differential resistance quantum oscillations FeSb2 with embedded antimony

Multiband nodeless superconductivity near the charge-density-wave quantum critical point in ZrTe(3-x)Sex

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Chinese Physics B 2016年第7期25卷 89-92页

作者：崔珊何兰坡洪晓晨朱相德 cedomir petrovic 李世燕 State Key Laboratory of Surface Physics Department of Physics and Laboratory of Advanced MaterialsFudan University High Magnetic Field Laboratory Chinese Academy of Sciences and University of Science and Technology of China Condensed Matter Physics and Materials Science Department Brookhaven National Laboratory Collaborative Innovation Center of Advanced Microstructures

It was found that selenium doping can suppress the charge-density-wave（CDW） order and induce bulk superconductivity in ZrTe3. The observed superconducting dome suggests the existence of a CDW quantum critical point（QCP） in ZrTe3-xSex near x ≈ 0.04. To elucidate the superconducting state near the CDW QCP, we measure the thermal conductivity of two ZrTe（3-x）Sex single crystals（x = 0.044 and 0.051） down to 80 m K. For both samples, the residual linear term κ0/T at zero field is negligible, which is a clear evidence for nodeless superconducting gap. Furthermore, the field dependence of κ0/T manifests a multigap behavior. These results demonstrate multiple nodeless superconducting gaps in ZrTe（3-x）Sex,which indicates conventional superconductivity despite of the existence of a CDW QCP.

关键词： superconductivity charge-density-wave order thermal transport measurement gap structure

Quantization of the band at the surface of charge density wave material 2H-TaSe_(2)

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Chinese Physics B 2021年第4期30卷 106-112页

作者： Man Li Nan Xu Jianfeng Zhang Rui Lou Ming Shi Lijun Li Hechang Lei cedomir petrovic Zhonghao Liu Kai Liu Yaobo Huang Shancai Wang Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijing 100872China Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201204China Institute of Advanced Studies Wuhan UniversityWuhan 430072China Swiss Light Source Paul Scherrer InstituteCH-5232 VilligenSwitzerland Chongqing Technology and Busineee University Chongqing 400067China Condensed Matter Physics and Materials Science Department Brookhaven National LaboratoryUptonNY 11973USA State Key Laboratory of Functional Materials for Informatics and Center for Excellence in Superconducting Electronics SIMITChinese Academy of SciencesShanghai 200050China

By using angle-resolvea photoemission spectroscopy(ARPES) combined with the first-principies electronic structure calculations,we report the quantized states at the surface of a single crystal 2 H-TaSe_(2).We have observed sub-bands of quantized states at the three-dimensional Brillouin zone center due to a highly dispersive band with light effective mass along k_(z) *** quantized sub-bands shift upward towards E_(F) while the bulk band at Γ shifts downward with the decrease of temperature across charge density wave(CDW) *** band shifts could be intimately related to the *** neither the two-dimensional Fermi-surface nesting nor purely strong electron-phonon coupling can explain the mechanism of CDW in 2 H-TaSe_(2),our experiment may ignite the interest in understanding the CDW mechanism in this family.

关键词： angle-resolved photoemission spectroscopy transition metal dichalcogenide TaSe_(2)

Prototype of highly efficient liquid electrode pulsating corona plasma reactor for degradation of organics in water

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Plasma Science and Technology 2019年第12期21卷 67-77页

作者： Sasa RANCEV Milica petrovic Dragan RADIVOJEVIC Aleksandar BOJIC cedomir MALUCKOV Miodrag RADOVIC University of Nis Faculty of Science and MathematicsDepartment of PhysicsVisegaradska 3318000NisSerbia University of Nis Faculty of Science and MathematicsDepartment of ChemistryVisegradska 3318000NisSerbia University of Belgrade Technical Faculty in BorDepartment for Inorganic Chemical TechnologyVojske Jugoslavije 1219210 BorSerbia

Prototype of atmospheric pressure non-thermal corona plasma reactor, developed for degradation of organics in water, operates at significantly higher frequency than other reactors for that purpose, and without sparks. Its construction provides the umbrella shaped, sustained pulsating corona discharge, with defined discharge oscillations on a given pulse frequency above the water surface. Dye degradation rate decreases with the decrease of discharge current density. Plasmaformed H2O2 is consumed in dye degradation. The energy yield of dye degradation is 2.45 g k Wh^-1 for 50 ppm solution, which is higher than in other publications for comparable experimental conditions.

关键词： corona pulsating frequency degradation