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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Bi4Te3 by Materials Project

Bi4Te3 is MAX Phase-derived structured and crystallizes in the trigonal R-3m space group. The structure is two-dimensional and consists of three Bi4Te3 sheets oriented in the (0, 0, 1) direction. there are two inequivalent Bi+1.50+ sites. In the first Bi+1.50+ site, Bi+1.50+ is bonded to six Te2- atoms to form a mixture of edge and corner-sharing BiTe6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are three shorter (3.11 Å) and three longer (3.29 Å) Bi–Te bond lengths. In the second Bi+1.50+ site, Bi+1.50+ is bonded in a 3-coordinate geometry to three equivalent Te2- atoms. All Bi–Te bond lengths are 3.66 Å. There are two inequivalent Te2- sites. In the first Te2- site, Te2- is bonded to six equivalent Bi+1.50+ atoms to form a mixture of edge and corner-sharing TeBi6 octahedra. The corner-sharing octahedral tilt angles are 5°. In the second Te2- site, Te2- is bonded to six Bi+1.50+ atoms to form a mixture of distorted edge and corner-sharing TeBi6 octahedra. The corner-sharing octahedral tilt angles are 5°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Bi8Te7 by Materials Project

Bi4Te3(BiTe)4 is MAX Phase-derived structured and crystallizes in the trigonal P-3m1 space group. The structure is two-dimensional and consists of three Bi4Te3 sheets oriented in the (0, 0, 1) direction and four BiTe sheets oriented in the (0, 0, 1) direction. In each Bi4Te3 sheet, there are four inequivalent Bi+1.75+ sites. In the first Bi+1.75+ site, Bi+1.75+ is bonded in a 3-coordinate geometry to three equivalent Te2- atoms. All Bi–Te bond lengths are 3.74 Å. In the second Bi+1.75+ site, Bi+1.75+ is bonded to six Te2- atoms to form a mixture of corner and edge-sharing BiTe6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are three shorter (3.12 Å) and three longer (3.31 Å) Bi–Te bond lengths. In the third Bi+1.75+ site, Bi+1.75+ is bonded in a 3-coordinate geometry to three equivalent Te2- atoms. All Bi–Te bond lengths are 3.71 Å. In the fourth Bi+1.75+ site, Bi+1.75+ is bonded to six Te2- atoms to form a mixture of corner and edge-sharing BiTe6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are three shorter (3.11 Å) and three longer (3.30 Å) Bi–Te bond lengths. There are three inequivalent Te2- sites. In the first Te2- site, Te2- is bonded to six Bi+1.75+ atoms to form a mixture of distorted corner and edge-sharing TeBi6 octahedra. The corner-sharing octahedral tilt angles are 5°. In the second Te2- site, Te2- is bonded to six Bi+1.75+ atoms to form a mixture of distorted corner and edge-sharing TeBi6 octahedra. The corner-sharing octahedral tilt angles are 5°. In the third Te2- site, Te2- is bonded to six Bi+1.75+ atoms to form a mixture of corner and edge-sharing TeBi6 octahedra. The corner-sharing octahedral tilt angles are 5°. In each BiTe sheet, there are three inequivalent Bi+1.75+ sites. In the first Bi+1.75+ site, Bi+1.75+ is bonded to six Te2- atoms to form a mixture of corner and edge-sharing BiTe6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are three shorter (3.10 Å) and three longer (3.29 Å) Bi–Te bond lengths. In the second Bi+1.75+ site, Bi+1.75+ is bonded to six Te2- atoms to form a mixture of corner and edge-sharing BiTe6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are three shorter (3.12 Å) and three longer (3.29 Å) Bi–Te bond lengths. In the third Bi+1.75+ site, Bi+1.75+ is bonded in a 3-coordinate geometry to three equivalent Te2- atoms. All Bi–Te bond lengths are 3.78 Å. There are three inequivalent Te2- sites. In the first Te2- site, Te2- is bonded in a 6-coordinate geometry to six Bi+1.75+ atoms. In the second Te2- site, Te2- is bonded to six Bi+1.75+ atoms to form edge-sharing TeBi6 octahedra. In the third Te2- site, Te2- is bonded in a 6-coordinate geometry to three equivalent Bi+1.75+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2024

Interfacially Enhanced Superconductivity in Fe(Te,Se)/Bi 4 Te 3 Heterostructures

Realizing topological superconductivity by integrating high-transition-temperature (T C ) superconductors with topological insulators can open new paths for quantum computing applications. Here, a new approach is reported for increasing the superconducting transition temperature $T^{onset}_C$ by interfacing the unconventional superconductor Fe(Te,Se) with the topological insulator Bi–Te system in the low-Se doping regime, near where superconductivity vanishes in the bulk. The critical finding is that the $T^{onset}_C$ of Fe(Te,Se) increases from nominally non-superconducting to as high as 12.5 K when Bi 2 Te3 is replaced with the topological phase Bi 4 Te 3 . Interfacing Fe(Te,Se) with Bi4Te3 is also found to be critical for stabilizing superconductivity in monolayer films where $T^{onset}_C$ can be as high as 6 K. Measurements of the electronic and crystalline structure of the Bi 4 Te 3 layer reveal that a large electron transfer, epitaxial strain, and novel chemical reduction processes are critical factors for the enhancement of superconductivity. This novel route for enhancing T C in an important epitaxial system provides new insight on the nature of interfacial superconductivity and a platform to identify and utilize new electronic phases.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗