Fig. 1: Lattice structure and CDW in ScV6Sn6.
From: Low-energy electronic structure in the unconventional charge-ordered state of ScV6Sn6
a Crystal structure of ScV6Sn6 (above the CDW transition). The V kagome layer is sandwiched by ScSn2 and Sn layers. Gray lines outline the unit cell. The view from the top shows the V-based kagome layer. Orange and purple dashed diamonds indicate the in-plane unit cell above and below the CDW transition temperature, respectively. b CDW phase transition revealed by nano-infrared (nano-IR) images. The normalized nano-IR scattering amplitude s4 plotted as a function of temperature. Inset: images of s4 at TCDW and 2 K below it, respectively. Scale bar: 0.5 μm. c, STM topography (0.2 V, 100 pA) of the V-terminated surface in the CDW phase. d The Fourier transform of c with the CDW and the atomic Bragg peaks marked by red and green circles, respectively. e Line profile extracted along the red arrow in c, showing the lattice reconstruction due to the CDW. f dI/dV tunneling spectra on different surface terminations, as indicated. The peaks at the density of states just below EF correspond to the vHSs seen in ARPES.
