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

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

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The locally noncentrosymmetric heavy fermion superconductor CeRh2As2 has attracted considerable inter-ests due to its rich superconducting phases,accompanied by possible quadrupole density wave and pronounced antiferromagnetic excitations.To understand the underlying physics,here we report measurements from high-resolution angle-resolved photoemission.Our 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 contributions.The FS shows signs of nesting with an in-plane vector q1=(π/a,π/a),which is facilitated by the heavy bands near(X)arising from the characteristic conduction-f hybridization.The FS nesting provides a natural explanation for the observed antiferromagnetic spin fluctuations at(π/a,π/a),which might be the driving force for its unconventional superconductivity.Our experimental results can be reasonably explained by density functional theory plus dynamical mean field theory calculations,which can capture the strong correlation effects.Our study not only provides spectroscopic signature of the key factors underlying the field-induced super-conducting transition,but also uncovers the critical role of FS nesting and lattice Kondo effect in the underlying magnetic fluctuations.

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

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Center for Correlated Matter and School of Physics,Zhejiang University,Hangzhou 310058,China

Institute for Advanced Materials,Hubei Normal University,Huangshi 435002,China

Swiss Light Source,Paul Scherrer Institut,CH-5232 Villigen PSI,Switzerland

Institut for Mathematische Physik,38106 Braunschweig,Germany

Max Planck Institute for Chemical Physics of Solids,01187 Dresden,Germany

Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China

State Key Laboratory of Silicon Materials,Zhejiang University,Hangzhou 310058,China

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National Key R&D Program of ChinaNational Key R&D Program of ChinaState Key Project of Zhejiang ProvinceNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaKey R&D Program of Zhejiang Province,ChinaBridging Grant with China,Japan,South KoreaASEAN region funded by the Swiss State Secretariat for Education,Research and InnovationMAX Ⅳ Laboratory for time on Beamline BLOCHSwedish Research CouncilSwedish Governmental Agency for Innovation SystemsFormas

2022YFA1402202023YFA1406303LZ22A040007U23A205801217433112204159122743642021C01002BG11-072020202003062018-071522018-049692019-02496

2024

10.1088/0256-307X/41/9/097403

中国物理快报(英文版)
中国科学院物理研究所,中国物理学会

中国物理快报(英文版)

CSTPCDEI
影响因子：0.515
ISSN：0256-307X
年,卷(期)：2024.41(9)