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ID 19363
file
creator
Rader, Oliver
Pampuch, Carsten
Shikin, Alexander M.
Gudat, Wolfgang
Okabayashi, Jun
Mizokawa, Takashi
Fujimori, Atsushi
Hayashi, Toshiaki
Tanaka, Masaaki
subject
manganese compounds
magnetic semiconductors
photoemission
semiconductor epitaxial layers
molecular beam epitaxial growth
valence bands
gallium arsenide
semimagnetic semiconductors
abstract
Ga1-xMnxAs, x = 0.043, has been grown ex situ on GaAs(100) by low-temperature molecular-beam epitaxy. On the reprepared p(1 x 1) surface, resonant photoemission of the valence band shows a 20-fold enhancement of the Mn 3d contribution at the L3 edge. The difference spectrum is similar to our previously obtained resonant photoemission at the Mn M edge, in particular a strong satellite appears and no clear Fermi edge ruling out strong Mn 3d weight at the valence-band maximum. The x-ray absorption lineshape differs from previous publications. Our calculation based on a configuration-interaction cluster model reproduces the x-ray absorption and the L3 on-resonance photoemission spectrum for model parameters Δ, Udd, and (pdσ) consistent with our previous work and shows the same spectral shape on and off resonance thus rendering resonant photoemission measured at the L3 edge representative of the Mn 3d contribution. At the same time, the results are more bulk sensitive due to a probing depth about twice as large as for photoemission at the Mn M edge. The confirmation of our previous results obtained at the M edge calls recent photoemission results into question which report the absence of the satellite and good agreement with local-density theory.
journal title
Physical Review B - Condensed Matter and Materials Physics
volume
Volume 69
issue
Issue 7
start page
075202-1
end page
075202-7
date of issued
2004-02-06
publisher
American Physical Society
issn
0163-1829
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 2004 The American Physical Society.
relation url
department
Graduate School of Science
Graduate School of Advanced Sciences of Matter



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