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

Yi Wu ¹Yongjun Zhang ²Sailong Ju ³Yong Hu ³Yanen Huang ¹Yanan Zhang ¹Huali Zhang ¹Hao Zheng ¹Guowei Yang ¹Evrard-Ouicem Eljaouhari ⁴Baopeng Song ²Nicholas C.Plumb ³Frank Steglich ⁵Ming Shi ⁶Gertrud Zwicknagl ⁷Chao Cao ¹Huiqiu Yuan ⁸Yang Liu⁹

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作者信息

1. Center for Correlated Matter and School of Physics,Zhejiang University,Hangzhou 310058,China
2. Institute for Advanced Materials,Hubei Normal University,Huangshi 435002,China
3. Swiss Light Source,Paul Scherrer Institut,CH-5232 Villigen PSI,Switzerland
4. Institut for Mathematische Physik,38106 Braunschweig,Germany
5. Center for Correlated Matter and School of Physics,Zhejiang University,Hangzhou 310058,China;Max Planck Institute for Chemical Physics of Solids,01187 Dresden,Germany
6. Center for Correlated Matter and School of Physics,Zhejiang University,Hangzhou 310058,China;Swiss Light Source,Paul Scherrer Institut,CH-5232 Villigen PSI,Switzerland
7. Institut for Mathematische Physik,38106 Braunschweig,Germany;Max Planck Institute for Chemical Physics of Solids,01187 Dresden,Germany
8. Center for Correlated Matter and School of Physics,Zhejiang University,Hangzhou 310058,China;Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China;State Key Laboratory of Silicon Materials,Zhejiang University,Hangzhou 310058,China
9. Center for Correlated Matter and School of Physics,Zhejiang University,Hangzhou 310058,China;Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China
折叠

Abstract

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.

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基金项目

National Key R&D Program of China(2022YFA140220)

National Key R&D Program of China(2023YFA1406303)

State Key Project of Zhejiang Province(LZ22A040007)

National Natural Science Foundation of China(U23A20580)

National Natural Science Foundation of China(12174331)

National Natural Science Foundation of China(12204159)

National Natural Science Foundation of China(12274364)

Key R&D Program of Zhejiang Province,China(2021C01002)

Bridging Grant with China,Japan,South Korea(BG11-072020)

ASEAN region funded by the Swiss State Secretariat for Education,Research and Innovation()

MAX Ⅳ Laboratory for time on Beamline BLOCH(20200306)

Swedish Research Council(2018-07152)

Swedish Governmental Agency for Innovation Systems(2018-04969)

Formas(2019-02496)

出版年

2024

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)

CSTPCDCSCDEI

影响因子：0.515

ISSN：0256-307X

参考文献量81

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