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

被引:6
|
作者
Wu, Yi [1 ,2 ]
Zhang, Yongjun [3 ]
Ju, Sailong [4 ]
Hu, Yong [4 ]
Huang, Yanen [1 ,2 ]
Zhang, Yanan [1 ,2 ]
Zhang, Huali [1 ,2 ]
Zheng, Hao [1 ,2 ]
Yang, Guowei [1 ,2 ]
Eljaouhari, Evrard-Ouicem [5 ]
Song, Baopeng [3 ]
C. Plumb, Nicholas [4 ]
Steglich, Frank [1 ,2 ,6 ]
Shi, Ming [1 ,2 ,4 ]
Zwicknagl, Gertrud [5 ,6 ]
Cao, Chao [1 ,2 ]
Yuan, Huiqiu [1 ,2 ,7 ,8 ]
Liu, Yang [1 ,2 ,7 ]
机构
[1] Zhejiang Univ, Ctr Correlated Matter, Hangzhou 310058, Peoples R China
[2] Zhejiang Univ, Sch Phys, Hangzhou 310058, Peoples R China
[3] Hubei Normal Univ, Inst Adv Mat, Huangshi 435002, Peoples R China
[4] Paul Scherrer Inst, Swiss Light Source, Villigen PSI, CH-5232 Villigen, Switzerland
[5] Inst Math Phys, D-38106 Braunschweig, Germany
[6] Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany
[7] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Peoples R China
[8] Zhejiang Univ, State Key Lab Silicon Mat, Hangzhou 310058, Peoples R China
基金
国家重点研发计划; 中国国家自然科学基金; 瑞典研究理事会;
关键词
HIDDEN-ORDER; EXCITATIONS; TRANSITION; RESONANCE; STATE;
D O I
10.1088/0256-307X/41/9/097403
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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 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 = (pi/a, pi/a), which is facilitated by the heavy bands near X<overline> arising from the characteristic conduction-f hybridization. The FS nesting provides a natural explanation for the observed antiferromagnetic spin fluctuations at (pi/a, pi/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 superconducting transition, but also uncovers the critical role of FS nesting and lattice Kondo effect in the underlying magnetic fluctuations.
引用
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页数:6
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