Nodeless electron pairing in CsV3Sb5-derived kagome superconductors

Zhong，Yigui1; Liu，Jinjin2,3; Wu，Xianxin4; Guguchia，Zurab5; Yin，J. X.6,7; Mine，Akifumi1; Li，Yongkai2,3,8; Najafzadeh，Sahand1; Das，Debarchan5; Mielke，Charles5; Khasanov，Rustem5; Luetkens，Hubertus5; Suzuki，Takeshi1; Liu，Kecheng1; Han，Xinloong9; Kondo，Takeshi1,10; Hu，Jiangping11; Shin，Shik1,12; Wang，Zhiwei2,3,8; Shi，Xun2,3; Yao，Yugui2,3,8; Okazaki，Kozo1,10,13

2023

10.1038/s41586-023-05907-x

Nature   Impact Factor & Quartile

0028-0836

1476-4687

The newly discovered kagome superconductors represent a promising platform for investigating the interplay between band topology, electronic order and lattice geometry. Despite extensive research efforts on this system, the nature of the superconducting ground state remains elusive. In particular, consensus on the electron pairing symmetry has not been achieved so far, in part owing to the lack of a momentum-resolved measurement of the superconducting gap structure. Here we report the direct observation of a nodeless, nearly isotropic and orbital-independent superconducting gap in the momentum space of two exemplary CsVSb-derived kagome superconductors—Cs(VNb)Sb and Cs(VTa)Sb—using ultrahigh-resolution and low-temperature angle-resolved photoemission spectroscopy. Remarkably, such a gap structure is robust to the appearance or absence of charge order in the normal state, tuned by isovalent Nb/Ta substitutions of V. Our comprehensive characterizations of the superconducting gap provide indispensable information on the electron pairing symmetry of kagome superconductors, and advance our understanding of the superconductivity and intertwined electronic orders in quantum materials.

SCI

English

NI Journal Papers ; NI论文

Others

National Key Research and~Development Program of China["2020YFA0308800","2022YFA1403400"] ; null[JP18K13498] ; null[JP19H01818] ; null[JP19H00651] ; null[JP21H04439] ; null[JP19H05826] ; null[JPMXS0118068681] ; null[12061131002] ; null[12234003] ; null[92065109] ; null[Z210006] ; null[Z190006] ; null[Y01202500] ; null[2022M723112] ; null[2022YFA1403901] ; null[NSFC-1188810]

Science & Technology - Other Topics

Multidisciplinary Sciences

WOS:001002447800005

NATURE PORTFOLIO

BIOLOGY & BIOCHEMISTRY;CLINICAL MEDICINE;MULTIDISCIPLINARY;PLANT & ANIMAL SCIENCE;ENVIRONMENT/ECOLOGY;SOCIAL SCIENCES, GENERAL;MICROBIOLOGY;ECONOMICS BUSINESS;IMMUNOLOGY;MATERIALS SCIENCE;COMPUTER SCIENCE;SPACE SCIENCE;MOLECULAR BIOLOGY & GENETICS;CHEMISTRY;NEUROSCIENCE & BEHAVIOR;PHYSICS;GEOSCIENCES;ENGINEERING

2-s2.0-85153630187

Scopus

1.Institute for Solid States Physics,The University of Tokyo,Kashiwa,Japan
2.Centre for Quantum Physics,Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE),School of Physics,Beijing Institute of Technology,Beijing,China
3.Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems,Beijing Institute of Technology,Beijing,China
4.CAS Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing,China
5.Laboratory for Muon Spin Spectroscopy,Paul Scherrer Institute,Villigen PSI,Switzerland
6.Laboratory for Quantum Emergence,Department of Physics,Southern University of Science and Technology,Shenzhen,China
7.Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong),Shenzhen,China
8.Material Science Center,Yangtze Delta Region Academy of Beijing Institute of Technology,Jiaxing,China
9.Kavli Institute of Theoretical Sciences,University of Chinese Academy of Sciences,Beijing,China
10.Trans-scale Quantum Science Institute,The University of Tokyo,Tokyo,Japan
11.Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing,China
12.Office of University Professor,The University of Tokyo,Kashiwa,Japan
13.Material Innovation Research Center,The University of Tokyo,Kashiwa,Japan

Zhong，Yigui,Liu，Jinjin,Wu，Xianxin,et al. Nodeless electron pairing in CsV3Sb5-derived kagome superconductors[J]. Nature,2023.

Zhong，Yigui.,Liu，Jinjin.,Wu，Xianxin.,Guguchia，Zurab.,Yin，J. X..,...&Okazaki，Kozo.(2023).Nodeless electron pairing in CsV3Sb5-derived kagome superconductors.Nature.

Zhong，Yigui,et al."Nodeless electron pairing in CsV3Sb5-derived kagome superconductors".Nature (2023).