Roton pair density wave in a strong-coupling kagome superconductor

doi:10.1038/s41586-021-03983-5

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	Roton pair density wave in a strong-coupling kagome superconductor
	Chen, Hui ; Yang, Haitao ; Hu, Bin ; Zhao, Zhen ; Yuan, Jie ; Xing, Yuqing ; Qian, Guojian ; Huang, Zihao ; Li, Geng ; Ye, Yuhan
刊名	NATURE
	2021
卷号	599 期号:7884 页码:222-228
关键词	TOTAL-ENERGY CALCULATIONS STATE SUPERFLUID FERMIONS
ISSN号	0028-0836
DOI	10.1038/s41586-021-03983-5
英文摘要	The transition metal kagome lattice materials host frustrated, correlated and topological quantum states of matter(1-9). Recently, a new family of vanadium-based kagome metals, AV(3)Sb(5) (A = K, Rb or Cs), with topological band structures has been discovered(10,11). These layered compounds are nonmagnetic and undergo charge density wave transitions before developing superconductivity at low temperatures(11-19). Here we report the observation of unconventional superconductivity and a pair density wave (PDW) in CsV3Sb5 using scanning tunnelling microscope/spectroscopy and Josephson scanning tunnelling spectroscopy. We find that CsV3Sb5 exhibits a V-shaped pairing gap Delta similar to 0.5 meV and is a strong-coupling superconductor (2 Delta/k(B)T(c) - 5) that coexists with 4a(0) unidirectional and 2a(0) x 2a(0) charge order. Remarkably, we discover a 3Q PDW accompanied by bidirectional 4a(0)/3 spatial modulations of the superconducting gap, coherence peak and gap depth in the tunnelling conductance. We term this novel quantum state a roton PDW associated with an underlying vortex-antivortex lattice that can account for the observed conductance modulations. Probing the electronic states in the vortex halo in an applied magnetic field, in strong field that suppresses superconductivity and in zero field above T-c, reveals that the PDW is a primary state responsible for an emergent pseudogap and intertwined electronic order. Our findings show striking analogies and distinctions to the phenomenology of high-T-c cuprate superconductors, and provide groundwork for understanding the microscopic origin of correlated electronic states and superconductivity in vanadium-based kagome metals.
学科主题	Science & Technology - Other Topics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/27656]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.Weizmann Inst Sci, Dept Condensed Matter Phys, Rehovot, Israel 2.Boston Coll, Dept Phys, Chestnut Hill, MA 02167 USA 3.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing, Peoples R China 4.Chinese Acad Sci, Beijing Natl Ctr Condensed Matter Phys, Beijing, Peoples R China 5.Chinese Acad Sci, Inst Phys, Beijing, Peoples R China 6.Univ Chinese Acad Sci, Sch Phys Sci, Beijing, Peoples R China 7.Univ Chinese Acad Sci, CAS Ctr Excellence Topol Quantum Computat, Beijing, Peoples R China 8.Songshan Lake Mat Lab, Dongguan, Peoples R China 9.Renmin Univ China, Beijing Key Lab Optoelect Funct Mat Micronano Dev, Dept Phys, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Chen, Hui,Yang, Haitao,Hu, Bin,et al. Roton pair density wave in a strong-coupling kagome superconductor[J]. NATURE,2021,599(7884):222-228.
APA	Chen, Hui.,Yang, Haitao.,Hu, Bin.,Zhao, Zhen.,Yuan, Jie.,...&Gao, Hong-Jun.(2021).Roton pair density wave in a strong-coupling kagome superconductor.NATURE,599(7884),222-228.
MLA	Chen, Hui,et al."Roton pair density wave in a strong-coupling kagome superconductor".NATURE 599.7884(2021):222-228.