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The kagomé metals RbTi 3 Bi 5 and CsTi 3 Bi 5

Journal Article · · Zeitschrift fur Naturforschung. B, A Journal of Chemical Sciences
 [1];  [2];  [2];  [2];  [2];  [3]
  1. Department Chemie , Ludwig-Maximilians-Universität München , Butenandtstraße 5–13 , 81377 München , Germany; OSTI
  2. Materials Department, Materials Research Laboratory and California Nanosystems Institute , University of California Santa Barbara , Santa Barbara , CA 93106 , USA
  3. Department Chemie , Ludwig-Maximilians-Universität München , Butenandtstraße 5–13 , 81377 München , Germany

Abstract

The kagomé metals RbTi3Bi5and CsTi3Bi5were 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) Å; RbTi3Bi5:a = 5.773(1),c = 9.065(1) Å). The titanium atoms form a kagomé 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 kagomé layers. Magnetic susceptibility measurements with CsTi3Bi5and RbTi3Bi5single crystals reveal Pauli-paramagnetism and traces of superconductivity caused by CsBi2/RbBi2impurities. 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 kagomé band structure similar to that of CsV3Sb5with reduced band filling. A symmetry analysis of the band structure does not reveal an obvious and unique signature of a nontrivial topology.

Research Organization:
Univ. of California, Santa Barbara, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
DOE Contract Number:
SC0020305
OSTI ID:
2421536
Journal Information:
Zeitschrift fur Naturforschung. B, A Journal of Chemical Sciences, Journal Name: Zeitschrift fur Naturforschung. B, A Journal of Chemical Sciences Journal Issue: 11-12 Vol. 77; ISSN 0932-0776
Publisher:
de Gruyter
Country of Publication:
United States
Language:
English

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