Large elastic anisotropy in Brillouin scattering of copper-intercalated GaS and GaSe
Abstract
Brillouin scattering of bulk layered hexagonal gallium sulfide (GaS) and gallium selenide (GaSe) was measured both as pristine materials and intercalated with copper and silver. The sound velocities, refractive index, and four of the five independent elastic stiffnesses (cij) were determined. Values of the c11 elastic stiffness in thin crystals are higher than in previous measurements, bringing the elastic anisotropy (c11/c33) into a range typical of other layered materials. Copper intercalation showed a larger effect on acoustic phonons in GaS than in GaSe.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (5)
Daniel Paulo-Wach
Department of Materials Science and Engineering, University of California Berkeley 1 , Berkeley, California 94720,
Ethan Chen
Masaru Nakamura
Okinawa Churashima Foundation Research Institute
Oscar D. Dubon
Department of Materials Science and Engineering, University of California Berkeley 1 , Berkeley, California 94720,
Kristie J. Koski
Department of Chemistry, University of California, Davis, 1 Shields Avenue, Davis, California 95616, United States