Researchers reveal electronic nature of charge density wave and electron-phonon coupling in Kagome superconductor

3Sat5. Author: Institute of Physics “width =” 800 “height =” 432″/>

Crystal structure and surface of Fermi KV3Sat5. Author: Institute of Physics

Recently, Kagome AV superconductors3Sat5 (A = K, Rb and Cs) have attracted a lot of attention due to their new phenomena and rich physics. They demonstrate an unconventional charge density wave (GWP), a giant anomalous Hall effect, and superconductivity. The CDW condition is closely related to the abnormal Hall effect and competes with superconductivity under pressure. The study of the electronic structure of the CDW state is essential for understanding its nature and related physical properties.

High-resolution angular separation photoemission spectroscopy (ARPES) is a powerful method for studying the electronic structures of materials in the pulse space. Recently, Luo Hailan in a group of Professor Zhou Xinjiang from the Institute of Physics of the Chinese Academy of Sciences (CAS) conducted ARPES measurements with high resolution on HF.3Sat5 and revealed the nature of VZP and electron-phonon communication in HF3Sat5.

From ARPES measurements, researchers observed clear evidence of the reconstruction of the 2 × 2 CDW electronic structure induced. These include the reconstruction of the Fermi surface associated with their folds of the band structure between the boundary and the center of the pristine Brillouin zone, and the CDW slit holes at the boundary of the primary and reconstructed Brillouin zones.

Near the Fermi level, the surface-dependent and momentum-dependent gap gap was measured, and strong anisotropy of the gap gap anisotropy was observed for all V-derived Fermi surface sheets.

Moreover, for all V-derived bands electron-phonon communication signatures were detected.

  • Researchers reveal the electronic nature of charge density waves and electron-phonon communication in the Kagome superconductor

    Evidence of the reconstruction of the electronic structure in HF3Sat5. Author: Institute of Physics

  • Researchers reveal the electronic nature of charge density waves and electron-phonon communication in the Kagome superconductor

    CDW-induced band splitting and gap opening in measured HF band structures3Sat5 at 20 K and their comparison with band structure calculations. Author: Institute of Physics

  • Researchers reveal the electronic nature of charge density waves and electron-phonon communication in the Kagome superconductor

    Dependent on the Fermi surface and on the impulse of the VZP gaps KV3Sat5 measured in 5 thousand Credit: Institute of Physics

  • Researchers reveal the electronic nature of charge density waves and electron-phonon communication in the Kagome superconductor

    Signatures of electron-phonon communication in HF3Sat5. Author: Institute of Physics

These observations suggest that electron-phonon coupling may play a dominant role in managing the transition to VZP. They also provide key information for understanding the origin of CDW and its interaction with other physical properties in AV3Sat5 Kagome Superconductors.

This study was published in The nature of communication.


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Additional information:
Hailan Luo et al., Electronic nature of charge density waves and electron-phonon coupling in the KA3 KV3Sb5 superconductor, The nature of communication (2022). DOI: 10.1038 / s41467-021-27946-6

Provided by the Chinese Academy of Sciences

Citation: Researchers discover the electronic nature of the charge density wave and electron-phonon communication in the Kagome superconductor (2022, February 18), obtained February 18, 2022 from https://phys.org/news/2022-02-reveal-electronic- nature-density-electron-phonon.html

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