Phonon lifetimes in bulk AlN and their temperature dependence

Citation
M. Kuball et al., Phonon lifetimes in bulk AlN and their temperature dependence, APPL PHYS L, 77(13), 2000, pp. 1958-1960
Citations number
22
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
APPLIED PHYSICS LETTERS
ISSN journal
00036951 → ACNP
Volume
77
Issue
13
Year of publication
2000
Pages
1958 - 1960
Database
ISI
SICI code
0003-6951(20000925)77:13<1958:PLIBAA>2.0.ZU;2-9
Abstract
We report on the Raman analysis of the phonon lifetimes of the A(1)(LO) (lo ngitudinal optical) and E-2(high) phonons in bulk AlN crystals and their te mperature dependence from 10 to 1275 K. Our experimental results show that amongst the various possible decay channels, the A(1)(LO) phonons decay pri marily into two phonons of equal energy (Klemens model), most likely longit udinal-acoustic phonons, whereas the E-2(high) phonon decays asymmetrically into a high-energy and a low-energy phonon. Possible decay channels of the E-2(high) phonon have been shown to include combinations of E-2(low) and a coustic phonons. Phonon lifetimes of the A(1)(LO) phonon and the E-2(high) phonon of 0.75 and 2.9 ps, respectively, were measured at 10 K. (C) 2000 Am erican Institute of Physics. [S0003-6951(00)00339-9].