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Li, Haoxiang; Fabbris, G.; Said, A. H.; Sun, J. P.; Jiang, Yu-Xiao; Yin, J.-X.; Pai, Yun-Yi; Yoon, Sangmoon; Lupini, Andrew R.; Nelson, C. S.; Yin, Q. W.; Gong, C. S.; Tu, Z. J.; Lei, H. C.; Cheng, J.-G.; Hasan, M. Z.; Wang, Ziqiang; Yan, Binghai; Thomale, R.; Lee, H. N.; Miao, H.
Nature communications, 10/2022, Volume: 13, Issue: 1Journal Article
Abstract The electronic instabilities in CsV 3 Sb 5 are believed to originate from the V 3 d -electrons on the kagome plane, however the role of Sb 5 p -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 3 Sb 5 , where a 2 × 2 × 1 CDW in the kagome sublattice and a Sb 5 p -electron assisted 2 × 2 × 2 CDW coexist. At ambient pressure, we discover a resonant enhancement on Sb L 1 -edge (2 s →5 p ) 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 3 Sb 5 go beyond the minimal framework of kagome electronic bands near van Hove filling.
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