Testing electron–phonon coupling for the superconductivity in kagome metal CsV3Sb5

Yigui Zhong; Shaozhi Li; Hongxiong Liu; Yuyang Dong; Kohei Aido; Yosuke Arai; Haoxiang Li; Weilu Zhang; Youguo Shi; Ziqiang Wang; Shik Shin; H. N. Lee; H. Miao; Takeshi Kondo; Kozo Okazaki

doi:10.1038/s41467-023-37605-7

Testing electron–phonon coupling for the superconductivity in kagome metal CsV₃Sb₅

Yigui Zhong, Shaozhi Li, Hongxiong Liu, Yuyang Dong, Kohei Aido, Yosuke Arai, Haoxiang Li, Weilu Zhang, Youguo Shi, Ziqiang Wang, Shik Shin, H. N. Lee, H. Miao, Takeshi Kondo, Kozo Okazaki

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

In crystalline materials, electron-phonon coupling (EPC) is a ubiquitous many-body interaction that drives conventional Bardeen-Cooper-Schrieffer superconductivity. Recently, in a new kagome metal CsV₃Sb₅, superconductivity that possibly intertwines with time-reversal and spatial symmetry-breaking orders is observed. Density functional theory calculations predicted weak EPC strength, λ, supporting an unconventional pairing mechanism in CsV₃Sb₅. However, experimental determination of λ is still missing, hindering a microscopic understanding of the intertwined ground state of CsV₃Sb₅. Here, using 7-eV laser-based angle-resolved photoemission spectroscopy and Eliashberg function analysis, we determine an intermediate λ=0.45–0.6 at T = 6 K for both Sb 5p and V 3d electronic bands, which can support a conventional superconducting transition temperature on the same magnitude of experimental value in CsV₃Sb₅. Remarkably, the EPC on the V 3d-band enhances to λ~0.75 as the superconducting transition temperature elevated to 4.4 K in Cs(V_0.93Nb_0.07)₃Sb₅. Our results provide an important clue to understand the pairing mechanism in the kagome superconductor CsV₃Sb₅.

Original language	English
Article number	1945
Journal	Nature Communications
Volume	14
Issue number	1
DOIs	https://doi.org/10.1038/s41467-023-37605-7
State	Published - Dec 2023

Funding

The authors thank Yaoming Dai, Kun Jiang and Binghai Yan for stimulating discussions, and thank Yongkai Li, Jinjin Liu and Zhiwei Wang for technical supports. This research was sponsored by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division (x-ray scattering and theoretical analysis), and by Grants-in-Aid for Scientific Research (KAKENHI) (Grant Nos. JP18K13498, JP19H01818, JP19H00651 and JP21H04439) from the Japan Society for the Promotion of Science (JSPS), by JSPS KAKENHI on Innovative Areas “Quantum Liquid Crystals” (Grant No. JP19H05826), by the Center of Innovation Program from the Japan Science and Technology Agency, JST, and by MEXT Quantum Leap Flagship Program (MEXT Q-LEAP) (Grant No. JPMXS0118068681), and by MEXT as “Program for Promoting Researches on the Supercomputer Fugaku” (Basic Science for Emergence and Functionality in Quantum Matter Innovative Strongly-Correlated Electron Science by Integration of “Fugaku” and Frontier Experiments, JPMXP1020200104) (Project ID: hp200132/hp210163/hp220166). Y.G. S is supported by the National Natural Science Foundation of China (Grants No. U2032204), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grants No. XDB33030000). Z.Q.W is supported by the U.S. Department of Energy, Basic Energy Sciences Grant No. DE-FG02-99ER45747. The authors thank Yaoming Dai, Kun Jiang and Binghai Yan for stimulating discussions, and thank Yongkai Li, Jinjin Liu and Zhiwei Wang for technical supports. This research was sponsored by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division (x-ray scattering and theoretical analysis), and by Grants-in-Aid for Scientific Research (KAKENHI) (Grant Nos. JP18K13498, JP19H01818, JP19H00651 and JP21H04439) from the Japan Society for the Promotion of Science (JSPS), by JSPS KAKENHI on Innovative Areas “Quantum Liquid Crystals” (Grant No. JP19H05826), by the Center of Innovation Program from the Japan Science and Technology Agency, JST, and by MEXT Quantum Leap Flagship Program (MEXT Q-LEAP) (Grant No. JPMXS0118068681), and by MEXT as “Program for Promoting Researches on the Supercomputer Fugaku” (Basic Science for Emergence and Functionality in Quantum Matter Innovative Strongly-Correlated Electron Science by Integration of “Fugaku” and Frontier Experiments, JPMXP1020200104) (Project ID: hp200132/hp210163/hp220166). Y.G. S is supported by the National Natural Science Foundation of China (Grants No. U2032204), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grants No. XDB33030000). Z.Q.W is supported by the U.S. Department of Energy, Basic Energy Sciences Grant No. DE-FG02-99ER45747.

Funders	Funder number
Yaoming Dai, Kun Jiang and Binghai Yan
U.S. Department of Energy
Office of Science
Basic Energy Sciences
Division of Materials Sciences and Engineering	JP21H04439, JP19H01818, JP18K13498, JP19H00651
Japan Society for the Promotion of Science	JP19H05826
Ministry of Education, Culture, Sports, Science and Technology	hp200132/hp210163/hp220166, JPMXP1020200104, JPMXS0118068681
National Natural Science Foundation of China	U2032204
Japan Science and Technology Agency
Chinese Academy of Sciences	XDB33030000, DE-FG02-99ER45747

Access to Document

10.1038/s41467-023-37605-7

Cite this

@article{edbfc2776c014b86a4704d074c502dd1,

title = "Testing electron–phonon coupling for the superconductivity in kagome metal CsV3Sb5",

abstract = "In crystalline materials, electron-phonon coupling (EPC) is a ubiquitous many-body interaction that drives conventional Bardeen-Cooper-Schrieffer superconductivity. Recently, in a new kagome metal CsV3Sb5, superconductivity that possibly intertwines with time-reversal and spatial symmetry-breaking orders is observed. Density functional theory calculations predicted weak EPC strength, λ, supporting an unconventional pairing mechanism in CsV3Sb5. However, experimental determination of λ is still missing, hindering a microscopic understanding of the intertwined ground state of CsV3Sb5. Here, using 7-eV laser-based angle-resolved photoemission spectroscopy and Eliashberg function analysis, we determine an intermediate λ=0.45–0.6 at T = 6 K for both Sb 5p and V 3d electronic bands, which can support a conventional superconducting transition temperature on the same magnitude of experimental value in CsV3Sb5. Remarkably, the EPC on the V 3d-band enhances to λ~0.75 as the superconducting transition temperature elevated to 4.4 K in Cs(V0.93Nb0.07)3Sb5. Our results provide an important clue to understand the pairing mechanism in the kagome superconductor CsV3Sb5.",

author = "Yigui Zhong and Shaozhi Li and Hongxiong Liu and Yuyang Dong and Kohei Aido and Yosuke Arai and Haoxiang Li and Weilu Zhang and Youguo Shi and Ziqiang Wang and Shik Shin and Lee, {H. N.} and H. Miao and Takeshi Kondo and Kozo Okazaki",

note = "Publisher Copyright: {\textcopyright} 2023, The Author(s).",

year = "2023",

month = dec,

doi = "10.1038/s41467-023-37605-7",

language = "English",

volume = "14",

journal = "Nature Communications",

issn = "2041-1723",

publisher = "Nature Research",

number = "1",

}

TY - JOUR

T1 - Testing electron–phonon coupling for the superconductivity in kagome metal CsV3Sb5

AU - Zhong, Yigui

AU - Li, Shaozhi

AU - Liu, Hongxiong

AU - Dong, Yuyang

AU - Aido, Kohei

AU - Arai, Yosuke

AU - Li, Haoxiang

AU - Zhang, Weilu

AU - Shi, Youguo

AU - Wang, Ziqiang

AU - Shin, Shik

AU - Lee, H. N.

AU - Miao, H.

AU - Kondo, Takeshi

AU - Okazaki, Kozo

PY - 2023/12

Y1 - 2023/12

N2 - In crystalline materials, electron-phonon coupling (EPC) is a ubiquitous many-body interaction that drives conventional Bardeen-Cooper-Schrieffer superconductivity. Recently, in a new kagome metal CsV3Sb5, superconductivity that possibly intertwines with time-reversal and spatial symmetry-breaking orders is observed. Density functional theory calculations predicted weak EPC strength, λ, supporting an unconventional pairing mechanism in CsV3Sb5. However, experimental determination of λ is still missing, hindering a microscopic understanding of the intertwined ground state of CsV3Sb5. Here, using 7-eV laser-based angle-resolved photoemission spectroscopy and Eliashberg function analysis, we determine an intermediate λ=0.45–0.6 at T = 6 K for both Sb 5p and V 3d electronic bands, which can support a conventional superconducting transition temperature on the same magnitude of experimental value in CsV3Sb5. Remarkably, the EPC on the V 3d-band enhances to λ~0.75 as the superconducting transition temperature elevated to 4.4 K in Cs(V0.93Nb0.07)3Sb5. Our results provide an important clue to understand the pairing mechanism in the kagome superconductor CsV3Sb5.

AB - In crystalline materials, electron-phonon coupling (EPC) is a ubiquitous many-body interaction that drives conventional Bardeen-Cooper-Schrieffer superconductivity. Recently, in a new kagome metal CsV3Sb5, superconductivity that possibly intertwines with time-reversal and spatial symmetry-breaking orders is observed. Density functional theory calculations predicted weak EPC strength, λ, supporting an unconventional pairing mechanism in CsV3Sb5. However, experimental determination of λ is still missing, hindering a microscopic understanding of the intertwined ground state of CsV3Sb5. Here, using 7-eV laser-based angle-resolved photoemission spectroscopy and Eliashberg function analysis, we determine an intermediate λ=0.45–0.6 at T = 6 K for both Sb 5p and V 3d electronic bands, which can support a conventional superconducting transition temperature on the same magnitude of experimental value in CsV3Sb5. Remarkably, the EPC on the V 3d-band enhances to λ~0.75 as the superconducting transition temperature elevated to 4.4 K in Cs(V0.93Nb0.07)3Sb5. Our results provide an important clue to understand the pairing mechanism in the kagome superconductor CsV3Sb5.

UR - http://www.scopus.com/inward/record.url?scp=85152039096&partnerID=8YFLogxK

U2 - 10.1038/s41467-023-37605-7

DO - 10.1038/s41467-023-37605-7

M3 - Article

C2 - 37029104

AN - SCOPUS:85152039096

SN - 2041-1723

VL - 14

JO - Nature Communications

JF - Nature Communications

IS - 1

M1 - 1945

ER -

Testing electron–phonon coupling for the superconductivity in kagome metal CsV₃Sb₅

Abstract

Funding

Access to Document

Other files and links

Fingerprint

Cite this