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Type: Artigo de periódico
Title: High-resolution synchrotron radiation Renninger scan to examine hybrid reflections in InGaP/GaAs(001)
Author: Hayashi, MA
Avanci, LH
Cardoso, LP
Bettini, J
de Carvalho, MMG
Morelhao, SL
Collins, SP
Abstract: High-resolution synchrotron radiation Renninger scans (RS) have been used in the analysis of hybrid reflections in the InGaP/GaAs structure. Four-beam cases involving two Bragg (primary and secondary) and one Laue (secondary) reflections of the 002 Renninger scans for the GaAs substrate and the InGaP layer were analysed in detail. Different structures of asymmetry regarding the inplane directions [110] and [1<(1) over bar 10>] were observed from the measurements of the same three families of four-beam cases, {1<(1) over bar >}< (1) over bar > /{1< (1) over bar > 1}3, {20}0/{20}2 and {3< (1) over bar > } < (1) over bar > /{3 < (1) over bar >}3, at phi several positions. The comparison between the experimental and MULTX simulated scan clearly shows a marked asymmetry observed on the {20}0/{20}2 contributions. An asymmetric peak instead of the simulated dip appears due to the layer Laue secondary beam {20}0 crossing the layer/substrate interface to generate a hybrid peak. The break in the lattice coherence for this heterostructure is shown by the occurrence of an unexpected dip in the layer RS, which does not obey the mirror symmetry.
Subject: X-ray multiple diffraction
Renninger scans
hybrid reflections
heteroepitaxial structures
lattice coherence
Country: Dinamarca
Editor: Munksgaard Int Publ Ltd
Citation: Journal Of Synchrotron Radiation. Munksgaard Int Publ Ltd, v. 6, n. 29, n. 33, 1999.
Rights: aberto
Identifier DOI: 10.1107/S0909049598012953
Date Issue: 1999
Appears in Collections:Unicamp - Artigos e Outros Documentos

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