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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on RhPb by Materials Project

RhPb crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Rh is bonded in a distorted q6 geometry to four equivalent Rh and six Pb atoms. All Rh–Rh bond lengths are 2.89 Å. There are four shorter (2.81 Å) and two longer (2.89 Å) Rh–Pb bond lengths. There are two inequivalent Pb sites. In the first Pb site, Pb is bonded in a 9-coordinate geometry to six equivalent Rh atoms. In the second Pb site, Pb is bonded in a hexagonal planar geometry to six equivalent Rh atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Flat bands in the CoSn-type compounds

Quantum interference on the kagome lattice generates electronic bands with narrow bandwidth, called flat bands. Crystal structures incorporating this lattice can host strong electron correlations with nonstandard ingredients, but only if these bands lie at the Fermi level. In the six compounds with the CoSn structure type (FeGe, FeSn, CoSn, NiIn, RhPb, and PtTl) the transition metals form a kagome lattice. The two iron variants are robust antiferromagnets so we focus on the latter four and investigate their thermodynamic and transport properties. We consider these results and calculated band structures to locate and characterize the flat bands in these materials. Finally, we propose that CoSn and RhPb deserve the community's attention for exploring flat-band physics.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗