The kagome metals RbTi3Bi5 and CsTi3Bi5

Werhahn, Dominik; Ortiz, Brenden R.; Hay, Aurland K.; Wilson, Stephen D.; Seshadri, Ram und Johrendt, Dirk (2022): The kagome metals RbTi3Bi5 and CsTi3Bi5. In: Zeitschrift für Naturforschung Section B - A Journal of Chemical Sciences, Bd. 77, Nr. 11-12: S. 757-764

Abstract

The kagome metals RbTi3Bi5 and CsTi3Bi5 were synthesized both as polycrystalline powders by heating the elements in an argon atmosphere and as single crystals grown using a self-flux method. The compounds crystallize in the hexagonal crystal system isotypically to KV3Sb5 (P6/mmm, Z = 1, CsTi3Bi5: a = 5.7873(1), c = 9.2062(1) angstrom;RbTi3Bi5: a = 5.773(1), c = 9.065(1) angstrom). The titanium atoms form a kagome net with bismuth atoms in the hexagons as well as above and below the triangles. The alkali metal atoms are coordinated by 12 bismuth atoms and form AlB2-like slabs between the kagome layers. Magnetic susceptibility measurements with CsTi3Bi5 and RbTi3Bi5 single crystals reveal Pauli-paramagnetism and traces of superconductivity caused by CsBi2/RbBi2 impurities. Magnetotransport measurements reveal conventional Fermi liquid behavior and quantum oscillations indicative of a single dominant orbit at low temperature. DFT calculations show the characteristic metallic kagome band structure similar to that of CsV3Sb5 with reduced band filling. A symmetry analysis of the band structure does not reveal an obvious and unique signature of a nontrivial topology.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Chemie und Pharmazie > Department Chemie
• Themengebiete: 500 Naturwissenschaften und Mathematik > 540 Chemie
• ISSN: 0932-0776
• Sprache: Englisch