SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 23: Kagome Systems

TT 23.5: Vortrag

Dienstag, 28. März 2023, 10:30–10:45, HSZ 304

X-ray diffraction on the charge-density wave in the Kagome superconductor RbV₃Sb₅ — •Sabreen Hammouda¹, Yu-Hui Liang², Po-Chun Chang², Carsten Paulmann³, Yishui Zhou¹, Adrian Merrit¹, Pikesh Pal¹, Rahaf Yaseen¹, Hongxiong Liu⁴, Youguo Shi⁴, Chao-Hung Du², and Yixi Su¹ — ¹JCNS-MLZ, Forschungszentrum Jülich, 85748 Garching, Germany — ²Dept. of Phys., Tamkang University, Tamsui 251, Taiwan — ³DESY, 22607 Hamburg, Germany — ⁴IOP, CAS, Beijing 100190, China

The newly discovered Kagome superconductors AV₃Sb₅ (A=K, Rb or Cs), in which non-trivial band topology, charge-density wave (CDW), and superconductivity are intertwined, have attracted tremendous interests. Despite extensive recent investigations via X-ray diffraction (XRD) and other complementary local probe techniques, it remains a major challenge to gain a consistent picture of the CDW modulation across different AV₃Sb₅ samples. In this talk, we will present our recent single-crystal XRD investigations (in-house and synchrotron) of the CDW modulations over a wide temperature range in the less-studied RbV₃Sb₅. A unique CDW modulation of the 2x2x2 type can be confirmed for RbV₃Sb₅ below T_CDW = 102 K, and no evidence for CDW fluctuations above T_CDW could be found. Our detailed temperature dependence measurements of the CDW superstructure reflections indicate a second-order phase transition with a 2D Ising character. A comparison to other AV₃Sb₅ compounds and possible implications on the understanding of the nature of the CDW in these Kagome superconductors will be given.