Diffuse scattering and Raman spectroscopy of doped CsV₃Sb₅
Author: Wecker, Julia
Affiliation: Karlsruher Institut für Technologie
Type: Poster
Display Dates: 20.07.2026 - 21.07.2026
Board: MT-045
The metallic Kagome materials AV₃Sb₅ (where A = K, Rb, Cs) exhibit a range of intriguing properties, including time reversal symmetry breaking, anomalous Hall effect or electronic nematicity. Their electronic band structure is characterized by flat bands, Dirac cones, and van Hove singularities. In particular, the well-studied CsV₃Sb₅ shows a charge density wave at TCDW = 94K and superconductivity at TSC = 2.5K. Chemical doping induces small changes in the electronic band structure and significantly affects the CDW and superconducting order. In this work, we investigated the influence of three different dopants in Cs(V1-xMx)3(Sb1-xXx)5 single crystals with (M = Mn (x ≈ 0.012), Cr (x ≈ 0.08) and X = Sn (x ≈ 0.016)), using temperature-dependent diffuse x-ray scattering and Raman spectroscopy. Mn and Cr doping suppress the CDW transition to lower temperatures. In the DS-data, a precursor signal is observed at the L-point of the Brillouin zone above the onset of the CDW order, which condenses below TCDW into sharp satellite peaks, indicating long-range 2x2 CDW order. This is consistent with the parent compound. In contrast, Sn doping suppresses the long-range order, leaving short-range correlations, with diffuse satellite peaks shifted to the ordering wave vector q = (~ 3/8, 0, 1/2) in the reciprocal space.