Discovery of conjoined charge density waves in the kagome superconductor CsV<sub>3</sub>Sb<sub>5</sub>.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 36289236.
- Also identified by DOI 10.1038/s41467-022-33995-2 and PMC identifier 9606281.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
The electronic instabilities in CsV<sub>3</sub>Sb<sub>5</sub> are believed to originate from the V 3d-electrons on the kagome plane, however 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 CsV<sub>3</sub>Sb<sub>5</sub>, 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 L<sub>1</sub>-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 CsV<sub>3</sub>Sb<sub>5</sub> go beyond the minimal framework of kagome electronic bands near van Hove filling.