Temperature and pressure dependence of Mg local modes in GaN

Authors
Kaczmarczyk, G Kaschner, A Hoffmann, A Thomsen, C
Citation
G. Kaczmarczyk et al., Temperature and pressure dependence of Mg local modes in GaN, APPL PHYS L, 78(2), 2001, pp. 198-200
Citations number
21
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
APPLIED PHYSICS LETTERS
ISSN journal
00036951 → ACNP
Volume
78
Issue
2
Year of publication
2001
Pages
198 - 200
Database
ISI
SICI code
0003-6951(20010108)78:2<198:TAPDOM>2.0.ZU;2-Y
Abstract
The temperature and pressure dependence of the zone-center phonons and of t he local vibrational modes of magnesium in the hexagonal modification of Ga N was studied within a valence-force model. The contribution caused by ther mal expansion was calculated and compared with the experiment. We find that the frequency shift of the local vibrational modes arises to a much larger extent from anharmonic decay into lower energy phonons than the shift of t he GaN host modes. (C) 2001 American Institute of Physics.