Discovery of Conjoined Charge Density Waves in the Kagome Superconductor CsV<sub>3</sub>Sb<sub>5</sub>

ORAL

Abstract

The observation of unconventional charge and pairing density waves in a kagome metal CsV3Sb5 is a striking analogy to the cuprate high-temperature superconductivity and the cascade orders in twisted bilayer graphene. While electronic instabilities in CsV3Sb5 are believed to originate from the V 3d-electrons on the kagome plane, the role of Sb 5p-electrons for 3-dimensional orders is largely unexplored. Here, using resonant tender X-ray scattering and high-pressure X-ray scattering, we report a rare realization of conjoined charge density waves (CDWs) in CsV3Sb5, where a 2*2*1 CDW in the kagome sublattice and a Sb 5p-electron assisted 2*2*2 CDW coexist. At ambient pressure, we discover a resonant enhancement on Sb L1-edge (2s->5p) at the 2*2*2 CDW wavevectors. The resonance, however, is absent at the 2*2*1 CDW wavevectors. Applying hydrostatic pressure, CDW transition temperatures are separated, where the 2*2*2 CDW emerges 4 K above the 2*2*1 CDW at 1 GPa. These observations demonstrate that symmetry-breaking phases in CsV3Sb5 go beyond the minimal framework of kagome electronic bands near van Hove filling.

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Presenters

  • Haoxiang Li

    • The Hong Kong University of Science and Technology (Guangzhou)

Authors

  • Haoxiang Li

    • The Hong Kong University of Science and Technology (Guangzhou)

  • Gilberto Fabbris

    • Argonne National Laboratory
    • Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL, USA

  • Ayman H Said

    • Argonne National Laboratory

  • J. P. Sun

    • Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences

  • Yu-Xiao Jiang

    • Princeton University

  • Jia-Xin Yin

    • 2Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, New Jersey 08544, USA
    • Princeton University

  • Yun-Yi Pai

    • Oak Ridge National Lab

  • Sangmoon Yoon

    • Oak Ridge National Lab

  • Andrew R Lupini

    • Oak Ridge National Lab

  • Christie Nelson

    • Brookhaven National Laboratory

  • Qiangwei Yin

    • Renmin University of China
    • Renmin University of China, Beijing, China

  • Chunsheng Gong

    • Renmin University of China
    • Renmin University of China, Beijing, China

  • Zhijun Tu

    • Renmin University of China
    • Renmin University of China, Beijing, China

  • Hechang Lei

    • Renmin University of China
    • Renmin University of China, Beijing, China
    • Princeton University

  • Jinguang Cheng

    • Chinese Academy of Sciences
    • Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
    • Institute of Physics Chinese Academy of Sciences

  • M. Zahid M Hasan

    • Princeton University

  • Ziqiang Wang

    • Boston College

  • Binghai Yan

    • Weizmann Institute of Science

  • Ronny Thomale

    • Julius-Maximilians University of Wuerzburg
    • Julius-Maximilians University of Wuerzbu
    • Institut für Theoretische Physik und Astrophysik Universität Würzburg, 97074 Würzburg, Germany
    • University of Wuerzburg

  • Ho Nyung Lee

    • Oak Ridge National Lab

  • Hu Miao

    • Oak Ridge National Lab
    • Oak Ridge National Laboratory
    • OAK RIDGE NATIONAL LABORATORY