Abstract
< p>Covalent two-dimensional metals with triangular motifs and confined elec tronic states are a rich playground in modern solid-state physics. Among t he non-magnetic materials\, systems that are based on kagome layers attrac t increasing attention as they naturally feature Dirac cones\, van-Hove si ngularities\, and flat bands in their electronic band structure. Some kago me-based metals have recently been found to exhibit favorable properties\, including unconventional superconductivity\, charge density waves (CDW)\, switchable chiral transport\, and signatures of an anomalous Hall effect (AHE). The vanadium-based kagome metal ScV₆Sn₆ undergoes a charge-dens ity-wave transition around 96 K. The origin of this transition is still u nder debate\, as well as the properties of the CDW phase\, as related to c hirality of the charge order or hidden magnetism. Nuclear magnetic resonan ce (NMR) is a versatile local technique with atomic resolution that provid es a unique perspective on the electronic properties of a material. We use ⁵¹V NMR to study the local properties of the CDW phase in single-cryst alline ScV₆Sn₆\, aided by density functional theory (DFT) [1]. We tra ce the dynamics of the local magnetic field during the CDW phase transitio n and determine a loss in the density of states (DOS) in excellent agreeme nt with DFT. The local charge symmetry of the V surroundings in the CDW ph ase reflects the commensurate modulation of the charge density with wave v ector q=(⅓\,⅓\,⅓). An unusual orientation-dependent change in the NM R shift splitting symmetry\, however\, reveals orbital-selective modulatio ns of the local DOS. In my talk I will introduce the method of single-crys tal NMR of complex quantum matter in the presence of CDWs\, and will give an overview of our recent findings in ScV₆Sn₆.[1] Guehne\, R. \, Noky\, J.\, Yi\, C.\, Shekhar\, C.\, Vergniory\, M. G.\, Baenitz\, M.\, &\; Felser\, C.\, Orbital selective commensurate modulations of the lo cal density of states in ScV₆Sn₆ probed by nuclear spins.
arXi v:2404.18597 (https://arxiv.org/abs/2404.18597).
BigBlueBu tton: https://bbb.tu-dresden.de/b/dar-mbs-me8-gsc (https://bbb.tu -dresden.de/b/dar-mbs-me8-gsc)
DTSTAMP:20260316T230601Z CREATED:20240514T053556Z LAST-MODIFIED:20240527T053832Z END:VEVENT END:VCALENDAR