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All sourcesNASA NTRSDOE OSTI
DOE OSTI2024

Frustrated Ising charge correlations in the kagome metal ScV 6 Sn 6

Here we resolve the real-space nature of the high-temperature, short-range charge correlations in the kagome metal ScV 6 Sn 6 . Diffuse scattering appears along a frustrated wave vector q H = ($\frac{1}{3}, \frac{1}{3}, \frac{1}{2}$) at temperatures far exceeding the charge order T CO = 92 K, preempting long-range charge order with wave vectors along q$_{\bar{K}}$ = ($\frac{1}{3}, \frac{1}{3}, \frac{1}{3}$). Using a combination of real space and reciprocal space analysis, we resolve the nature of the interactions between the primary out-of-plane Sc-Sn chain instability and the secondary strain-mediated distortion of the in-plane V kagome network. Finally, a minimal model of the diffuse scattering data reveals a high-temperature, short-ranged "zig-zag" phase of in-plane correlations that maps to a frustrated triangular lattice Ising model with antiferromagnetic interactions and provides a real-space understanding of the origin frustrated charge order in this material.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗
DOE OSTI2020

Materials Data on ScSn3 by Materials Project

ScSn3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Sc is bonded to twelve equivalent Sn atoms to form a mixture of corner and face-sharing ScSn12 cuboctahedra. There are six shorter (3.18 Å) and six longer (3.40 Å) Sc–Sn bond lengths. Sn is bonded in a 12-coordinate geometry to four equivalent Sc and eight equivalent Sn atoms. There are a spread of Sn–Sn bond distances ranging from 3.15–3.42 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ScSn3 by Materials Project

ScSn3 is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Sc is bonded to twelve Sn atoms to form ScSn12 cuboctahedra that share corners with four equivalent ScSn12 cuboctahedra, edges with eight equivalent ScSn12 cuboctahedra, edges with sixteen equivalent SnSc4Sn8 cuboctahedra, faces with four equivalent ScSn12 cuboctahedra, and faces with eight equivalent SnSc4Sn8 cuboctahedra. There are four shorter (3.14 Å) and eight longer (3.36 Å) Sc–Sn bond lengths. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded to four equivalent Sc and eight Sn atoms to form distorted SnSc4Sn8 cuboctahedra that share corners with twelve equivalent SnSc4Sn8 cuboctahedra, edges with eight equivalent ScSn12 cuboctahedra, edges with eight equivalent SnSc4Sn8 cuboctahedra, faces with four equivalent ScSn12 cuboctahedra, and faces with ten equivalent SnSc4Sn8 cuboctahedra. There are four shorter (3.14 Å) and four longer (3.36 Å) Sn–Sn bond lengths. In the second Sn site, Sn is bonded in a square co-planar geometry to four equivalent Sc and eight equivalent Sn atoms.

36 MATERIALS SCIENCE↗