Results for “SnBi” | Engineering Papers

DOE OSTI2020

Materials Data on SnBi by Materials Project

SnBi crystallizes in the orthorhombic Cmce space group. The structure is three-dimensional. Sn is bonded in a 5-coordinate geometry to five equivalent Sn and six equivalent Bi atoms. There are a spread of Sn–Sn bond distances ranging from 3.13–3.48 Å. There are a spread of Sn–Bi bond distances ranging from 3.33–3.62 Å. Bi is bonded in a 10-coordinate geometry to six equivalent Sn and four equivalent Bi atoms. There are two shorter (3.39 Å) and two longer (3.43 Å) Bi–Bi bond lengths.

36 MATERIALS SCIENCE↗

DOE OSTI2023

Superconductivity by alloying the topological insulator SnBi 2 Te 4

Alloying indium into the topological insulator SnBi 2 Te 4 induces bulk superconductivity with critical temperatures T c up to 1.85 K and upper critical fields up to about 14 kOe. This is confirmed by electrical resistivity, heat capacity, and magnetic susceptibility measurements. The heat capacity shows a discontinuity at T c and temperature dependence below T c consistent with weak coupling BCS theory, and suggests a superconducting gap near 0.25 meV. The superconductivity is type-II and the topological surface states have been verified by photoemission. Here, a simple picture suggests analogies with the isostructural magnetic topological insulator MnBi 2 Te 4 , in which a natural heterostructure hosts complementary properties on different sublattices, and motivates new interest in this large family of compounds. The existence of both topological surface states and superconductivity in Sn 1-x In x Bi 2 Te 4 identifies these materials as promising candidates for the study of topological superconductivity.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗