In:
Chinese Physics Letters, IOP Publishing, Vol. 38, No. 12 ( 2021-12-01), p. 127102-
Kurzfassung:
We report the structure and physical properties of two newly discovered compounds AV 8 Sb 12 and AV 6 Sb 6 (A = Cs, Rb), which have C 2 (space group: Cmmm ) and C 3 (space group: R 3 ¯ m ) symmetry, respectively. The basic V-kagome unit appears in both compounds, but stacking differently. A V 2 Sb 2 layer is sandwiched between two V 3 Sb 5 layers in AV 8 Sb 12 , altering the V-kagome lattice and lowering the symmetry of kagome layer from hexagonal to orthorhombic. In AV 6 Sb 6 , the building block is a more complex slab made up of two half-V 3 Sb 5 layers that are intercalated by Cs cations along the c -axis. Transport property measurements demonstrate that both compounds are nonmagnetic metals, with carrier concentrations at around 10 21 cm −3 . No superconductivity has been observed in CsV 8 Sb 12 above 0.3 K under in situ pressure up to 46 GPa. Compared to CsV 3 Sb 5 , theoretical calculations and angle-resolved photoemission spectroscopy reveal a quasi-two-dimensional electronic structure in CsV 8 Sb 12 with C 2 symmetry and no van Hove singularities near the Fermi level. Our findings will stimulate more research into V-based kagome quantum materials.
Materialart:
Online-Ressource
ISSN:
0256-307X
,
1741-3540
DOI:
10.1088/0256-307X/38/12/127102
Sprache:
Unbekannt
Verlag:
IOP Publishing
Publikationsdatum:
2021
ZDB Id:
2040565-0
SSG:
6,25