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Metals with kagome lattice provide bulk materials to host both the flat-band and Dirac electronic dispersions. A new family of kagome metals is recently discovered in A V 6 Sn 6 . The Dirac electronic structures of this material needs more experimental evidence to confirm. In the manuscript, we investigate this problem by resolving the quantum oscillations in both electrical transport and magnetization in ScV 6 Sn 6 . The revealed orbits are consistent with the electronic band structure models. Furthermore, the Berry phase of a dominating orbit is revealed to be around π , providing direct evidence for the topological band structure, which is consistent with calculations. Our results demonstrate a rich physics and shed light on the correlated topological ground state of this kagome metal., (Creative Commons Attribution license.)

The epitaxial growth of graphene on the Ag(001) surface via chemical vapor deposition (CVD) of propene and via liquid precursor deposition (LPD) by ex situ rinsing with acetone is investigated by X-ray photoelectron spectroscopy (XPS), low energy electron diffraction (LEED), and Fermi surface mapping (FSM). In case of LPD, the growth of graphene is quite similar to that previously obtained for h-BN monolayers on the same surface. The weak interaction between the graphene layer and the Ag(001) surface prevents a preferred alignment of the graphene lattice, leading to graphene domains with statistically distributed azimuthal orientations. In contrast to the LPD method, it is not possible to provide any carbon via the standard CVD technique. The present results give evidence that LPD represents a promising alternative for the growth of graphene, especially on weakly interacting surfaces. [ABSTRACT FROM AUTHOR]

Abstract: A second-generation toroidal spectrometer has been used to investigate the Fermi surface topology of the binary alloy system Cu3Au when prepared as an ordered or substitutionally disordered alloy. We demonstrate using two complementary Fermi surface mapping techniques and an empirical FS model for the disordered phase, that structures in the data arise from two different mechanisms. We observe distinct effects on the FS upon ordering, and compare the results with a recent bandstructure calculation. [Copyright &y& Elsevier]