Figure 1.

Lattice structure, Raman and phonon properties

(A) Schematic diagrams of the GaPS₄ crystal.

(B–D) The Raman spectra of GaPS₄ crystal of (B) 50–220 cm⁻¹, (C) 220–440 cm⁻¹, and (D) 440–650 cm⁻¹, measured at room temperature before and after the heating.

(E) Contour plot of temperature-dependent Raman spectra from 80 to 700 K.

(F) The phonon dispersion curve and density of states of GaPS₄ crystal.