Abstract
The electronic instabilities in CsV3Sb5 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 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.
| Original language | English |
|---|---|
| Article number | 6348 |
| Journal | Nature Communications |
| Volume | 13 |
| Issue number | 1 |
| DOIs | |
| State | Published - Dec 2022 |
Funding
This research was sponsored by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division (REXS and high-pressure X-ray diffraction and STEM). This research uses resources (REXS and high-pressure X-ray scattering at beam line 4ID and meV-IXS experiment at beam line 30-ID) of the Advanced Photon Source, a U.S. DOE Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357 and beamline 4-ID (X-ray scattering) of the National Synchrotron Light Source II, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under Contract No. DE-SC0012704. Extraordinary facility operations are supported in part by the DOE Office of Science through the National Virtual Biotechnology Laboratory, a consortium of DOE national laboratories focused on the response to COVID-19, with funding provided by the Coronavirus CARES Act. H.C.L. was supported by National Natural Science Foundation of China (Grant No. 12274459), Ministry of Science and Technology of China (Grant No. 2018YFE0202600) and Beijing Natural Science Foundation (Grant No. Z200005) (Sample growth). J.G.C. and J.P.S. was supported by National Natural Science Foundation of China (Grants No. 12025408, No. 11904391) (High-pressure X-ray scattering). Z.Q.W is supported by the U.S. Department of Energy, Basic Energy Sciences Grant No. DE-FG02-99ER45747 and by the Cottrell SEED Award No. 27856 from Research Corporation for Science Advancement (Theory). B.Y. acknowledges the financial support by the European Research Council (ERC Consolidator Grant \u201CNonlinearTopo\u201D, No. 815869) (Theory). R.T. acknowledges support from the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) through QUAST FOR 5249-449872909 (Project P3), through Project-ID 258499086-SFB 1170, and from the W\u00FCrzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter\u2013ct.qmat Project-ID 390858490-EXC 2147. Experimental and theoretical work at Princeton University was supported by the Gordon and Betty Moore Foundation (GBMF4547 and GBMF9461; M.Z.H.) and the U.S. DOE under the Basic Energy Sciences program (grant no. DOE/BES DE-FG-02-05ER46200). J.X.Y. acknowledges support from South University of Science and Technology of China principal research grant (No. Y01202500). We thank Matthew Brahlek, Kun Jiang, Jiaqiang Yan and Raphael Fernandes for stimulating discussions.