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All sourcesNASA NTRSDOE OSTI
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 OSTI2020

Materials Data on SnBi by Materials Project

SnBi is beta Sn-derived structured and crystallizes in the tetragonal I-4m2 space group. The structure is three-dimensional. Sn is bonded in a 6-coordinate geometry to two equivalent Sn and four equivalent Bi atoms. Both Sn–Sn bond lengths are 3.29 Å. All Sn–Bi bond lengths are 3.21 Å. Bi is bonded in a 6-coordinate geometry to four equivalent Sn and two equivalent Bi atoms. Both Bi–Bi bond lengths are 3.29 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SnBi by Materials Project

SnBi is Heusler-derived structured and crystallizes in the orthorhombic Cmmm space group. The structure is three-dimensional. Sn is bonded in a body-centered cubic geometry to four equivalent Sn and four equivalent Bi atoms. All Sn–Sn bond lengths are 3.39 Å. All Sn–Bi bond lengths are 3.40 Å. Bi is bonded in a body-centered cubic geometry to four equivalent Sn and four equivalent Bi atoms. All Bi–Bi bond lengths are 3.39 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SnBi by Materials Project

SnBi is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Sn is bonded in a body-centered cubic geometry to eight equivalent Bi atoms. All Sn–Bi bond lengths are 3.40 Å. Bi is bonded in a body-centered cubic geometry to eight equivalent Sn atoms.

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↗
DOE OSTI2020

Materials Data on SnBi3 by Materials Project

SnBi3 crystallizes in the tetragonal I4/mmm space group. The structure is two-dimensional and consists of two Bi sheets oriented in the (0, 0, 1) direction and two SnBi sheets oriented in the (0, 0, 1) direction. In each Bi sheet, Bi is bonded in a distorted square co-planar geometry to four equivalent Bi atoms. All Bi–Bi bond lengths are 3.32 Å. In each SnBi sheet, Sn is bonded in a square co-planar geometry to four equivalent Bi atoms. All Sn–Bi bond lengths are 3.32 Å. Bi is bonded in a square co-planar geometry to four equivalent Sn atoms.

36 MATERIALS SCIENCE↗