Mechanism of exotic density-wave and beyond-Migdal unconventional superconductivity in kagome metal AV <sub>3</sub>Sb <sub>5</sub> (A = K, Rb, Cs)

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Abstract

Exotic quantum phase transitions in metals, such as the electronic nematic state, have been discovered one after another and found to be universal now. The emergence of unconventional density-wave (DW) order in frustrated kagome metal AV ₃Sb ₅ and its interplay with exotic superconductivity attract increasing attention. We find that the DW in kagome metal is the bond order, because the sizable intersite attraction is caused by the quantum interference among paramagnons. This mechanism is important in kagome metals because the geometrical frustration prohibits the freezing of paramagnons. In addition, we uncover that moderate bond-order fluctuations mediate sizable pairing glue, and this mechanism gives rise to both singlet s-wave and triplet p-wave superconductivity. Furthermore, characteristic pressure-induced phase transitions in CsV ₃Sb ₅ are naturally understood by the present theory. Thus, both the exotic density wave and the superconductivity in geometrically frustrated kagome metals are explained by the quantum interference mechanism.

Abstract

Charge density wave and superconductivity in exotic kagome metals are realized by the quantum interference mechanism.

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\(\mathrm{Cs}{\mathrm{V}}_{3}{\mathrm{Sb}}_{5}\) : A \({\mathbb{Z}}_{2}\) Topological Kagome Metal with a Superconducting Ground State

Brenden R. Ortiz, Samuel Teicher, Yong Hu … (2020)

Recently discovered alongside its sister compounds KV_{3}Sb_{5} and RbV_{3}Sb_{5}, CsV_{3}Sb_{5} crystallizes with an ideal kagome network of vanadium and antimonene layers separated by alkali metal ions. This work presents the electronic properties of CsV_{3}Sb_{5}, demonstrating bulk superconductivity in single crystals with a T_{c}=2.5 K. The normal state electronic structure is studied via angle-resolved photoemission spectroscopy and density-functional theory, which categorize CsV_{3}Sb_{5} as a Z_{2} topological metal. Multiple protected Dirac crossings are predicted in close proximity to the Fermi level (E_{F}), and signatures of normal state correlation effects are also suggested by a high-temperature charge density wavelike instability. The implications for the formation of unconventional superconductivity in this material are discussed.

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Author and article information

Contributors

Rina Tazai:

ORCID: https://orcid.org/0000-0001-9794-3600

Role: ConceptualizationRole: Data curationRole: Formal analysisRole: Funding acquisitionRole: InvestigationRole: MethodologyRole: Project administrationRole: ResourcesRole: SoftwareRole: SupervisionRole: ValidationRole: VisualizationRole: Writing - original draftRole: Writing - review & editing

Youichi Yamakawa:

ORCID: https://orcid.org/0000-0002-6456-381X

Role: Data curationRole: Formal analysisRole: InvestigationRole: MethodologyRole: SoftwareRole: Visualization

Seiichiro Onari: Role: MethodologyRole: SoftwareRole: ValidationRole: Writing - review & editing

Hiroshi Kontani:

ORCID: https://orcid.org/0000-0002-8127-7903

Journal

Journal ID (nlm-ta): Sci Adv

Journal ID (iso-abbrev): Sci Adv

Journal ID (publisher-id): sciadv

Journal ID (hwp): advances

Title: Science Advances

Publisher: American Association for the Advancement of Science

ISSN (Electronic): 2375-2548

Publication date Collection: April 2022

Publication date (Electronic, pub): 01 April 2022

Volume: 8

Issue: 13

Electronic Location Identifier: eabl4108

Affiliations

Department of Physics, Nagoya University, Furo-cho, Nagoya 464-8602, Japan.

Author notes

[* ]Corresponding author. Email: tazai@ 123456s.phys.nagoya-u.ac.jp (R.T.); kon@ 123456slab.phys.nagoya-u.ac.jp (H.K.)

Author information

Rina Tazai https://orcid.org/0000-0001-9794-3600

Youichi Yamakawa https://orcid.org/0000-0002-6456-381X

Hiroshi Kontani https://orcid.org/0000-0002-8127-7903

Article

Publisher ID: abl4108

DOI: 10.1126/sciadv.abl4108

PMC ID: 10938589

PubMed ID: 35363527

SO-VID: 4b509532-e169-4e13-88f9-70ae21022bcb

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