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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on CdPS3 by Materials Project

CdPS3 crystallizes in the monoclinic C2/m space group. The structure is two-dimensional and consists of one CdPS3 sheet oriented in the (0, 0, 1) direction. Cd2+ is bonded to six S2- atoms to form edge-sharing CdS6 octahedra. All Cd–S bond lengths are 2.76 Å. P4+ is bonded in a trigonal non-coplanar geometry to three S2- atoms. All P–S bond lengths are 2.04 Å. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a distorted trigonal non-coplanar geometry to two equivalent Cd2+ and one P4+ atom. In the second S2- site, S2- is bonded in a distorted trigonal non-coplanar geometry to two equivalent Cd2+ and one P4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CdPS3 by Materials Project

CdPS3 crystallizes in the trigonal R-3 space group. The structure is two-dimensional and consists of three CdPS3 sheets oriented in the (0, 0, 1) direction. Cd2+ is bonded to six equivalent S2- atoms to form edge-sharing CdS6 octahedra. There are three shorter (2.76 Å) and three longer (2.77 Å) Cd–S bond lengths. P4+ is bonded in a trigonal non-coplanar geometry to three equivalent S2- atoms. All P–S bond lengths are 2.04 Å. S2- is bonded in a distorted trigonal non-coplanar geometry to two equivalent Cd2+ and one P4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2025

Symmetry progression and band vs Mott character of CdPS 3 under pressure

Complex chalcogenides are renowned for their tunable electronic, magnetic, and optical properties under external stimuli. The MPX 3 family (M = Mn, Ni, Co, V; X = S, Se) is a platform for many exciting discoveries—especially under compression—although CdPS3 is thought to be different because the Cd center possesses a filled 4d shell, which precludes Mottness. Here, we combine synchrotron-based infrared absorbance and Raman scattering spectroscopies with diamond anvil cell techniques, complementary lattice dynamics calculations, and an analysis of the energy landscape to reveal a series of structural phase transitions in CdPS 3 . We find four distinct pressure-driven transitions, with low frequency modes detectable over the full 35 GPa range of our investigation. A group–subgroup analysis along with our first-principles calculations allows us to partially unravel the space group sequence. For instance, the first critical pressure is a monoclinic C2/m to trigonal $\overline{R}$3 transition at 10 GPa. Despite the softness and overall sensitivity to pressure, we do not locate an insulator-to-metal transition in this pressure range, indicating that the energy scale for gap closure is significantly higher than expected. We discuss these findings in terms of force-induced color change and Mott vs band character in this system.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗