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The kagomé metals RbTi$_3$Bi$_5$ and CsTi$_3$Bi$_5$
arXiv - PHYS - Materials Science Pub Date : 2022-09-23 , DOI: arxiv-2209.11656 Dominik Werhahn, Brenden R. Ortiz, Aurland K. Hay, Stephen D. Wilson, Ram Seshadri, Dirk Johrendt
arXiv - PHYS - Materials Science Pub Date : 2022-09-23 , DOI: arxiv-2209.11656 Dominik Werhahn, Brenden R. Ortiz, Aurland K. Hay, Stephen D. Wilson, Ram Seshadri, Dirk Johrendt
The kagom\'e metals RbTi$_3$Bi$_5$ and CsTi$_3$Bi$_5$ were synthesized both
as polycrystalline powders by heating the elements an argon atmosphere and as
single crystals grown using a self-flux method. The compounds crystallize in
the hexagonal crystal system isotypically to KV$_3$Sb$_5$ (P6/mmm, Z = 1,
CsTi3Bi5: a = 5.7873(1) {\AA}, c = 9.2062(1) {\AA}; RbTi3Bi5: a = 5.773(1)
{\AA}, c = 9.065(1) {\AA}). Titanium atoms form a kagom\'e 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 AlB$_2$-like slabs
between the kagom\'e layers. Magnetic susceptibility measurements with
CsTi$_3$Bi$_5$ and RbTi$_3$Bi$_5$ single crystals reveal Pauli-paramagnetism
and traces of superconductivity caused by CsBi$_2$/RbBi$_2$ 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 kagom\'e band structure
similar to that of CsV$_3$Sb$_5$ with reduced band filling. A symmetry analysis
of the band structure does not reveal an obvious and unique signature of a
nontrivial topology.
更新日期：2022-09-26
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