Measurement of the density of states of a Al6Ru quasicrystalline alloy by ultrafast thermomodulation

Citation
Tae. Ferreira et al., Measurement of the density of states of a Al6Ru quasicrystalline alloy by ultrafast thermomodulation, SOL ST COMM, 118(1), 2001, pp. 37-41
Citations number
30
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
SOLID STATE COMMUNICATIONS
ISSN journal
00381098 → ACNP
Volume
118
Issue
1
Year of publication
2001
Pages
37 - 41
Database
ISI
SICI code
0038-1098(2001)118:1<37:MOTDOS>2.0.ZU;2-7
Abstract
In this paper, we present results of time-resolved optical measurements of electron dynamics in the metastable quasicrystal Al6Ru. A hot electron dist ribution is photo-excited by femtosecond laser pulses and the relaxation ra tes of the hot electron distribution cooling are measured. These rates are observed to change drastically close to the Fermi level and our results are compatible with the presence of a strong depression in the density of stat es (DOS) over an energy range of approximately 45 meV. These features have been predicted from numerical calculations of the density of states in many quasicrystalline materials and ours are the first experimental results in the optical domain to confirm these predictions. (C) 2001 Elsevier Science Ltd. All rights reserved.