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Tuning the Heavy Fermion State of CeFeGe3 by Ru Doping

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Chinese Physics Letters 2018年第6期35卷 66-69页

作者： Xin-Bei Xia Bin Shen michael smidman Ye Chen Hanoh Lee Hui-Qiu Yuan Center for Correlated Matter and Department of Physics Zhejiang UniversityHanKzhou 310058 Department of Physics Sungkyunkwan UniversitySuwon 440-746South Korea 3Collaborative Innovation Center of Advanced MicrostructuresNanjing 210093

We successfully synthesize a series of polycrystalline CeRuxFe1-xCe3（0≤x≤0.5）samples,which are characterized using powder x-ray diffraction,resistivity and specific heat *** expansion of the lattice constants with increasing x demonstrates the successful doping of Ru into the CeFeGe3 *** doping,it is found that the temperature up to which Landau-Fermi liquid behavior is observed in the resistivity is ***,there is also a pronounced increase in the resistivity coefficient and residual resistivity,as well as a clear upturn in C/T at low temperatures,suggesting that Ru doping may tune the system towards a quantum critical point.

关键词： Ru Tuning the Heavy Fermion State of CeFeGe3 by Ru Doping

CaPtAs: A new noncentrosymmetric superconductor

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Science China(Physics,Mechanics & Astronomy) 2020年第3期63卷 98-105页

作者： Wu Xie PeiRan Zhang Bin Shen WenBing Jiang GuiMing Pang Tian Shang Chao Cao michael smidman HuiQiu Yuan Center for Correlated Matter and Department of Physics Zhejiang UniversityHangzhou 310058China Physik-Institut Universitat ZürichZurich CH-8057Switzerland Department of Physics Hangzhou Normal UniversityHangzhou 310036China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

We report the discovery of a new noncentrosymmetric superconductor *** crystallizes in a tetragonal structure(space group I41md,No.109),featuring three dimensional honeycomb networks of Pt-As and a much elongated c-axis(a=b=4.18?,and c=43.70?).The superconductivity of CaPtAs with Tc=1.47 K was characterized by means of electrical resistivity,specific heat,and ac magnetic *** electronic specific heat Ce(T)/T shows evidence for a deviation from the behavior of a conventional BCS superconductor,and can be reasonably fitted by a p-wave *** upper critical fieldμ0Hc2 of CaPtAs exhibits a moderate anisotropy,with an in-plane value of around 204 mT and an out-of-plane value of 148 *** functional theory calculations indicate that the Pt-5 d and As-4 p orbitals mainly contribute to the density of states near the Fermi level,showing that the Pt-As honeycomb networks may significantly influence the superconducting properties.

关键词： noncentrosymmetric superconductivity CaPtAs

Structural and magnetic properties of CeZnAl3 single crystals

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Science China(Physics,Mechanics & Astronomy) 2018年第7期61卷 73-78页

作者： Qian Liu Bin Shen michael smidman Rui Li ZhiYong Nie XiaoYan Xiao Ye Chen Hanoh Lee HuiQiu Yuan Center for Correlated Matter and Department of Physics Zhejiang University Hangzhou 310058 China State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China

We have synthesized single crystals of CeZnAl3, which is a new member of family of Ce-based intermetallics CeTX3 （T=transition metal, X=Si, Ge, A1）, crystallizing in the non-centrosymmetric tetragonal BaNiSns-type structure. Magnetization, specific heat and resistivity measurements all show that CeZnAls orders magnetically below around 4.4 K. Furthermore, magnetization measurements exhibit a hysteresis loop at low temperatures and fields, indicating the presence of a ferromagnetic component in the magnetic state. This points to a different nature of the magnetism in CeZnAl3 compared to the other isostructural CeTAl3 compounds. Resistivity measurements under pressures up to 1.8 GPa show a moderate suppression of the ordering temperature with pressure, suggesting that measurements to higher pressures are required to look for quantum critical behavior.

关键词： non-centrosymmetric compounds ferromagnetism quantum phase transitions

Localized 4f-electrons in the quantum critical heavy fermion ferromagnet CeRh_(6)Ge_(4)

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Science Bulletin 2021年第14期66卷 1389-1394,M0003页

作者： An Wang Feng Du Yongjun Zhang David Graf Bin Shen Ye Chen Yang Liu michael smidman Chao Cao Frank Steglich Huiqiu Yuan Center for Correlated Matter and Department of Physics Zhejiang UniversityHangzhou 310058China Institute for Advanced Materials Hubei Normal UniversityHuangshi 435002China National High Magnetic Field Laboratory and Department of Physics Florida State UniversityTallahasseeFL 32306USA Zhejiang Province Key Laboratory of Quantum Technology and Device Department of PhysicsZhejiang UniversityHangzhou 310058China Department of Physics Hangzhou Normal UniversityHangzhou 310036China Max Planck Institute for Chemical Physics of Solids Dresden 01187Germany State Key Laboratory of Silicon Materials Zhejiang UniversityHangzhou 310058China

Ferromagnetic quantum critical points were predicted to be prohibited in clean itinerant ferromagnetic systems,yet such a phenomenon was recently revealed in CeRh_(6)Ge_(4),where the Curie temperature can be continuously suppressed to zero under a moderate hydrostatic *** we report the observation of quantum oscillations in CeRh_(6)Ge_(4)from measurements using the cantilever and tunnel-diode oscillator methods in fields up to 45 T,clearly demonstrating that the ferromagnetic quantum criticality occurs in a clean *** order to map the Fermi surface of CeRh_(6)Ge_(4),we performed angle-dependent measurements of quantum oscillations at ambient pressure,and compared the results to density functional theory *** results are consistent with the Ce 4f electrons remaining localized and not contributing to the Fermi surface,suggesting that localized ferromagnetism is a key factor for the occurrence of a ferromagnetic quantum critical point in CeRh_(6)Ge_(4).

关键词： Heavy fermions Ferromagnetism Quantum phase transitions Electronic structure

Ce-Site Dilution in the Ferromagnetic Kondo Lattice CeRh6Ge4

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Chinese Physics Letters 2021年第8期38卷 94-98页

作者：许嘉诚苏杭 Rohit Kumar 罗帅帅聂智勇王安杜锋李蕊 michael smidman 袁辉球 Center for Correlated Matter and Department of Physics Zhejiang University Zhejiang Province Key Laboratory of Quantum Technology and Device Department of PhysicsZhejiang University State Key Laboratory of Silicon Materials Zhejiang University

The heavy fermion ferromagnet CeRh6Ge4is the first example of a clean stoichiometric system where the ferromagnetic transition can be continuously suppressed by hydrostatic pressure to a quantum critical *** order to reveal the outcome when the magnetic lattice of CeRh6Ge4is diluted with non-magnetic atoms,this study reports comprehensive measurements of the physical properties of both single crystal and polycrystalline samples of *** increasing x,the Curie temperature decreases,and no transition is observed for x>0.25,while the system evolves from exhibiting coherent Kondo lattice behaviors at low x to the Kondo impurity scenario at large ***,non-Fermi liquid behavior is observed over a wide doping range,which agrees well with the disordered Kondo model for 0.52≤x≤0.66,while strange metal behavior is revealed in the vicinity of xc=0.26.

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Ce-Site Dilution in the Ferromagnetic Kondo Lattice CeRh_(6)Ge_(4)

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Chinese Physics Letters 2021年第8期38卷 79-83页

作者： Jia-Cheng Xu Hang Su Rohit Kumar Shuai-Shuai Luo Zhi-Yong Nie An Wang Feng Du Rui Li michael smidman Hui-Qiu Yuan Center for Correlated Matter and Department of Physics Zhejiang UniversityHangzhou 310058China Zhejiang Province Key Laboratory of Quantum Technology and Device Department of PhysicsZhejiang UniversityHangzhou 310058China State Key Laboratory of Silicon Materials Zhejiang UniversityHangzhou 310058China

The heavy fermion ferromagnet CeRh_(6)Ge_(4)is the first example of a clean stoichiometric system where the ferromagnetic transition can be continuously suppressed by hydrostatic pressure to a quantum critical *** order to reveal the outcome when the magnetic lattice of CeRh_(6)Ge_(4)is diluted with non-magnetic atoms,this study reports comprehensive measurements of the physical properties of both single crystal and polycrystalline samples of La_(x)Ce_(1-x)Rh_(6)Ge_(4).With increasing x,the Curie temperature decreases,and no transition is observed for x>0.25,while the system evolves from exhibiting coherent Kondo lattice behaviors at low x to the Kondo impurity scenario at large ***,non-Fermi liquid behavior is observed over a wide doping range,which agrees well with the disordered Kondo model for 0.52≤x≤0.66,while strange metal behavior is revealed in the vicinity of x_(c)=0.26.

关键词： Kondo magnetic system

La_(4)TX(T=Ru,Rh,Ir;X=Al,In):一个具有可调节反对称自旋轨道耦合强度的新型非中心对称超导体系

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Science China Materials 2023年第3期66卷 1114-1123页

作者：苏杭杜锋罗帅帅聂智勇李蕊谢武沈斌王云枫王安 Toshiro Takabatake 曹超 michael smidman 袁辉球 Center for Correlated Matter and School of Physics Zhejiang UniversityHangzhou 310058China Zhejiang Province Key Laboratory of Quantum Technology and Device School of PhysicsZhejiang UniversityHangzhou 310058China Department of Quantum Matter Graduate School of Advanced Science and EngineeringHiroshima UniversityHigashi-Hiroshima 739-8530Japan Condensed Matter Group Department of PhysicsHangzhou Normal UniversityHangzhou 311121China State Key Laboratory of Silicon Materials Zhejiang UniversityHangzhou 310058China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

本文报道了非中心对称化合物家族La_(4)TX(T=Ru,Rh,Ir;X=Al In)中的超导电性.该系列超导体具有立方晶体结构,空间群为F 43m La_(4)RuAl,La_(4)RhAl,La_(4)IrAl,La_(4)RuIn和La_(4)IrIn的超导转变温度在0.61–3.35 K之间,而La_(4)RuIn尚未被成功制备.La_(4)RuAl和La_(4)RhAl的低温比热可由无超导能隙节点的s波超导描述,而自旋-轨道耦合强度较大的La_(4)IrAl则可能存在能隙节点.这些超导体的上临界磁场都可由Werthamer-Helfand-Hohenberg模型描述,且上临界场Hc2(0)远低于泡利极限,说明轨道效应在库伯对拆对机制中占据主导.密度泛函理论计算表明,对于该超导家族的不同化合物,其反对称自旋-轨道耦合导致的能带劈裂存在明显区别,有助于进一步探究超导配对态与反对称自旋-轨道耦合强度之间的联系.

关键词：自旋轨道耦合超导转变温度密度泛函理论计算超导能隙非中心对称超导电性立方晶体上临界磁场

Fabrication of sub-20 nm MoS_(2) horizontal nanowire on silicon substrates by inclusion of precursors into polystyrene-bpolyethylene oxide nanopatterns: Detailed structural investigation

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Nano Research 2024年第3期17卷 2145-2153页

作者： Tandra Ghoshal michael A.Morris School of Chemistry AMBER and CRANNTrinity College DublinDublinIrelandD02 AK60

Herein,we demonstrate the fabrication of sub-20 nm MoS_(2) horizontal nanowire arrays on silicon substrates using a self-assembled block copolymer assisted in situ inclusion *** separated long-range ordered polystyrene-b-polyethylene oxide(PS-b-PEO)block copolymer(BCP)line-space nanopatterns were achieved through thermo-solvent *** patterns produced had long-range order and domain sizes>1μ*** BCP structures were lightly etched and modified by anhydrous ethanol to facilitate insertion of molybdenum precursor within the film maintaining the parent BCP *** ordered molybdenum oxide nanowire arrays were then fabricated by ultraviolet(UV)/ozone treatment at room *** oxides were converted to sulphides by thermal evaporation at different temperatures in Ar/H_(2) environment.X-ray photoelectron spectroscopy revealed the composition and phases of the molybdenum oxide and sulphide *** mapping was performed to investigate the interfaces between the oxide and sulphide nanowires with the substrate *** formation and stability of the sulphide nanowires were studied at different *** photoluminescence and Raman properties were studied at different formation temperatures to investigate defects and estimate the number of layers.

关键词： MoS_(2) block copolymer nanowires inclusion X-ray photoelectron spectroscopy(XPS) mapping photoluminescence

A GHz chirped amplitude-modulated laser for high-contrast plasma gratings

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High Power Laser Science and Engineering 2024年第1期12卷 74-83页

作者： michael Valdman Amir Hen Gilad Marcus Applied Physics Institute Hebrew University of JerusalemJerusalemIsrael

The generation and control of large amplitude plasma gratings and other plasma structures is of paramount importance for the realization of plasma photonics. Autoresonant excitation of such structures by means of chirped amplitude-modulated lasers has been recently discussed and analyzed theoretically. Here we discuss the parameter space for the realization of such a scheme and describe the laser system that was built towards this goal. We also expand our earlier theoretical study to account for the more realistic case of a moderately focused laser beam, instead of the simplified plane wave approximation.

关键词： amplitude modulation high-frequency modulation autoresonance ion acoustic wave