EuSn₂As₂: an exfoliatable magnetic layered Zintl–Klemm phase

Abstract

We synthesize EuSn2As2, the first exfoliatable layered magnetic Zintl–Klemm phase that features van der Waals bonding between neighboring layers.

Dirac Surface States in Intrinsic Magnetic Topological Insulators EuSn2As2 and Li1, Gao2, Duan3 et al. 2019Phys. Rev. X240101142View full textAdd to dashboardCite

“…Two adjacent SnAs layers are coupled by van der Waals force. This allows EuSn2As2 to be easily exfoliated into few-layer sheets like MnBi2Te4 [26,[30][31][32]41]. A previous study has revealed that EuSn2As2 undergoes a transition from a paramagnetic (PM) state to an AF state around 25 K [41], which is consistent with our measurements in Figs.…”

First-Principle Studies on the Ga and As Doping of Germanane Monolayer

“…Since the successful extraction of graphene by British scientists Andre Geim and Andre Geim using mechanical stripping in 2004, it has quickly led to the research and exploration of two-dimensional materials due to its excellent properties. In order to further enhance the application value of two-dimensional materials, it is important to improve the properties of materials by doing with graphene [1]- [14], transition-metal dichalcogenides [15] [16] [17] [18] [19] and other two-dimensional van der Waals material [20] [21] [22]. Germanane is a hydride similar to graphane with alternating hydrogen on either side of the germanium atom.…”

Na1−xSn2P2 as a new member of van der Waals-type layered tin pnictide superconductors

“…1a,c. Because of the vdW gap between the SnAs layers, it can be readily exfoliated through both mechanical and liquid-phase methods 9,10 . Besides, the sister compound SrSn 2 As 2 , having a crystal structure analogous to NaSn 2 As 2 , has been theoretically suggested to be very close to the topological critical point, hosting three-dimensional Dirac state at the Fermi level 11 , which was experimentally investigated by angle-resolved photoemission spectroscopy 12 .…”

“…Besides, the sister compound SrSn 2 As 2 , having a crystal structure analogous to NaSn 2 As 2 , has been theoretically suggested to be very close to the topological critical point, hosting three-dimensional Dirac state at the Fermi level 11 , which was experimentally investigated by angle-resolved photoemission spectroscopy 12 . There are various structural analogues with conducting tin-pnictide (SnPn) layers, including Sn 4 Pn 3 13,14 and ASnPn 15–19 , as well as ASn 2 Pn 2 9,10,12,20–22 , where A denotes alkali or alkaline earth metal (see Fig. 1).…”