Results for “BaSn3” | Engineering Papers

DOE OSTI2020

Materials Data on BaSn3 by Materials Project

BaSn3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ba is bonded to twelve equivalent Sn atoms to form a mixture of distorted face and corner-sharing BaSn12 cuboctahedra. There are six shorter (3.68 Å) and six longer (3.75 Å) Ba–Sn bond lengths. Sn is bonded in a 10-coordinate geometry to four equivalent Ba and six equivalent Sn atoms. There are two shorter (3.07 Å) and four longer (3.34 Å) Sn–Sn bond lengths.

36 MATERIALS SCIENCE↗

DOE OSTI2021

Observation of topological Dirac fermions and surface states in superconducting BaSn3

The interplay between topological electronic structure and superconductivity has attracted tremendous research interests recently as they could induce topological superconductivity (TSCs) which may be used to realize topological qubits for quantum computation. Among various TSC candidates, superconducting BaSn 3 (T c ~ 4.4K) has been predicted to be a topological Dirac semimetal (TDS) hosting two pairs of Dirac points along the Γ-A direction. Here, by combining the use of angle-resolved photoemission spectroscopy and ab initio calculations, we identified the predicted topological Dirac fermions and confirmed the TDS nature of the compound. In addition, we observed surface states connecting the Dirac points. Our observations demonstrate BaSn 3 as a superconductor with nontrivial topological electronic structures.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗