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Fermi Surface Nesting with Heavy Quasiparticles in the Locally Noncentrosymmetric Superconductor CeRh2As2

Chinese Physics Letters 2024年第9期41卷 107-121页

作者： Yi Wu Yongjun Zhang Sailong Ju Yong Hu Yanen Huang Yanan Zhang Huali Zhang Hao Zheng Guowei Yang Evrard-Ouicem Eljaouhari Baopeng Song Nicholas C.Plumb frank steglich Ming Shi Gertrud Zwicknagl Chao Cao Huiqiu Yuan Yang Liu Center for Correlated Matter and School of Physics Zhejiang UniversityHangzhou 310058China Institute for Advanced Materials Hubei Normal UniversityHuangshi 435002China Swiss Light Source Paul Scherrer InstitutCH-5232 Villigen PSISwitzerland Institut for Mathematische Physik 38106 BraunschweigGermany Max Planck Institute for Chemical Physics of Solids 01187 DresdenGermany Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China State Key Laboratory of Silicon Materials Zhejiang UniversityHangzhou 310058China

The locally noncentrosymmetric heavy fermion superconductor CeRh2As2 has attracted considerable interests due to its rich superconducting phases,accompanied by possible quadrupole density wave and pronounced antiferromagnetic *** understand the underlying physics,here we report measurements from highresolution angle-resolved *** results reveal fine splittings of the conduction bands related to the locally noncentrosymmetric structure,as well as a quasi-two-dimensional Fermi surface(FS)with strong 4𝑓*** FS shows signs of nesting with an in-plane vector q1=(π/α,π/α),which is facilitated by the heavy bands nearˉ𝑋arising from the characteristic conduction-X *** FS nesting provides a natural explanation for the observed antiferromagnetic spin fluctuations at(π/α,π/α),which might be the driving force for its unconventional *** experimental results can be reasonably explained by density functional theory plus dynamical mean field theory calculations,which can capture the strong correlation *** study not only provides spectroscopic signature of the key factors underlying the field-induced superconducting transition,but also uncovers the critical role of FS nesting and lattice Kondo effect in the underlying magnetic fluctuations.

关键词： symmetric Fermi conduction

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Fermi Surface Nesting with Heavy Quasiparticles in the Locally Noncentrosymmetric Superconductor CeRh2As2

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Chinese Physics Letters 2024年第9期 79-84页

作者： Yi Wu Yongjun Zhang Sailong Ju Yong Hu Yanen Huang Yanan Zhang Huali Zhang Hao Zheng Guowei Yang Evrard-Ouicem Eljaouhari Baopeng Song Nicholas C.Plumb frank steglich Ming Shi Gertrud Zwicknagl Chao Cao Huiqiu Yuan Yang Liu Center for Correlated Matter and School of Physics Zhejiang University Institute for Advanced Materials Hubei Normal University Swiss Light Source Paul Scherrer Institut Institut for Mathematische Physik Max Planck Institute for Chemical Physics of Solids Collaborative Innovation Center of Advanced Microstructures Nanjing University State Key Laboratory of Silicon Materials Zhejiang University

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Large transverse thermoelectric figure of merit in a topological Dirac semimetal

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Science China(Physics,Mechanics & Astronomy) 2020年第3期63卷 82-88页

作者： JunSen Xiang SiLe Hu Meng Lyu WenLiang Zhu ChaoYang Ma ZiYu Chen frank steglich GenFu Chen PeiJie Sun Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Department of Physics Key Laboratory of Micro-Nano Measurement-Manipulation and PhysicsBeihang UniversityBeijing 100191China University of Chinese Academy of Sciences Beijing 100049China Max Planck Institute for Chemical Physics of Solids Dresden 01187Germany Songshan Lake Materials Laboratory Dongguan 523808China

The Seebeck effect encounters a few fundamental constraints hindering its thermoelectric(TE)conversion *** notably,there are the charge compensation of electrons and holes that diminishes this effect,and the Wiedemann-Franz(WF)law that makes independent optimization of the corresponding electrical and thermal conductivities ***,we demonstrate that in the topological Dirac semimetal Cd3As2 the Nernst effect,i.e.,the transverse counterpart of the Seebeck effect,can generate a large TE figure of merit *** room temperature,zNT≈0.5 in a small field of 2 T and it significantly surmounts its longitudinal counterpart for any field.A large Nernst effect is generically expected in topological semimetals,benefiting from both the bipolar transport of compensated electrons and holes and their high *** this case,heat and charge transport are orthogonal,i.e.,not intertwined by the WF law *** importantly,further optimization of zNT by tuning the Fermi level to the Dirac node can be anticipated due to not only the enhanced bipolar transport,but also the anomalous Nernst effect arising from a pronounced Berry curvature.A combination of the topologically trivial and nontrivial advantages promises to open a new avenue towards high-efficient transverse thermoelectricity.

关键词： Dirac semimetal Cd3As2 Nernst effect transverse thermoelectricity

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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

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