Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “CaAgP”

Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

Materials Data on CaAgP by Materials Project

CaAgP is half-Heusler structured and crystallizes in the cubic F-43m space group. The structure is three-dimensional. Ca2+ is bonded in a body-centered cubic geometry to four equivalent Ag1+ and four equivalent P3- atoms. All Ca–Ag bond lengths are 2.89 Å. All Ca–P bond lengths are 2.89 Å. Ag1+ is bonded to four equivalent Ca2+ atoms to form AgCa4 tetrahedra that share corners with four equivalent PCa4 tetrahedra, corners with twelve equivalent AgCa4 tetrahedra, and edges with six equivalent PCa4 tetrahedra. P3- is bonded to four equivalent Ca2+ atoms to form PCa4 tetrahedra that share corners with four equivalent AgCa4 tetrahedra, corners with twelve equivalent PCa4 tetrahedra, and edges with six equivalent AgCa4 tetrahedra.

36 MATERIALS SCIENCE↗

Superconductivity and a van Hove singularity confined to the surface of a topological semimetal

The interplay between topology and superconductivity generated great interest in condensed matter physics. Here, we unveil an unconventional two-dimensional superconducting state in the Dirac nodal line semimetal ZrAs 2 which is exclusively confined to the top and bottom surfaces within the crystal's ab plane. As a remarkable consequence, we present the first clear evidence of a Berezinskii-Kosterlitz-Thouless (BKT) transition occurring solely on a material's surface-specifically, ZrAs 2 -unlike the inconsistent reports on PtBi 2 , CaAgP, and CaAg 1-x Pd x P. Furthermore, we find that these same surfaces also host a two-dimensional van Hove singularity near the Fermi energy. This leads to enhanced electronic correlations that contribute to the stabilization of superconductivity at the surface of ZrAs 2 . The'surface-confined nature of the van Hove singularity and associated superconductivity, realized for the first time, allows exploring the interplay between low-dimensional quantum topology and superconductivity in a bulk material without resorting to the superconducting proximity effect.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗