Author:
Roubi Larbi,Carlone Cosmo
Abstract
Mixed layered crystals of the type Hf1−xZrxS2, with x = 0.0, 0.1, 0.25, 0.5, 0.75, 0.90, and 1.0, have been grown by the iodine transport method. The direct (at the Γ points) and indirect (Γ to L) transitions have been measured (at T = 290 K) as a function of pressure from 0 to 30 kbar, and (at p = 0 kbar) as a function of the temperature (15–290 K). The phonon frequency assisting the indirect transition is 40 ± 2 MeV. The intrinsic (volume effect) and extrinsic (interaction effect) contributions to the change in electronic energy have been evaluated. We find that the electron–phonon interaction is more aptly described by a quasi-three-dimensional model than a purely two-dimensional one. From the shift of the indirect gap, we find that the electron–phonon coupling constant g varies linearly from 0.54 ± 0.03 (x = 0) to 0.44 ± 0.03 (x = 1.0).
Publisher
Canadian Science Publishing
Subject
General Physics and Astronomy
Cited by
4 articles.
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