Probing the Role of A-site Cations to Charge Density Wave (CDW) Order in kagome metal AV3Sb5 (A = K, Rb, Cs) through X-ray Scattering
- Title
- Probing the Role of A-site Cations to Charge Density Wave (CDW) Order in kagome metal AV3Sb5 (A = K, Rb, Cs) through X-ray Scattering
- Authors
- HEOSEUNGPIL, HEOSEUNGPIL; HEEMIN, LEE; LEE, BYUNG JUNE; Won Choongjae; JANG Hoyoung; PARK Sang-Youn; SHIN Dong-bin; 송창용
- Date Issued
- 2023-10-26
- Publisher
- 한국물리학회
- Abstract
- The vanadium-based kagome metal, AV3Sb5 (A=K, Rb, Cs), exhibits significant effects of A-site cations on the Charge Density Wave (CDW) phase and superconductivity. Notably, (K, Cs)V3Sb5 differs from Rb counterparts, showing distinct properties, such as nematicity and various CDW domains involving 2×2×1, 2×2×2 structure. Utilizing X-ray scattering, CDW structures in AV3Sb5 (A=K, Rb, Cs) were identified. Moreover, through time-resolved X-ray scattering, we examined the influence of A-site cations on the CDW phase in CsV3Sb5 which has a relatively elevated Tc, going beyond the limitations of previous doping and pressures studies. This revealed contrasting dynamics between 2×2×1 and 2×2×2 CDW orders after the photoexcitation of conduction electrons near the Fermi surface. Especially, the 2×2×2 CDW order exhibited complex behavior involving coherent phonon linked to the A-site cation's displacement. These findings offer strong support to the hypothesis that A-site ions significantly impact the 2×2×2 CDW phase in CsV3Sb5.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/122345
- Article Type
- Conference
- Citation
- 2023 KPS Fall Meeting, 2023-10-26
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