Anomalous Strain Behavior On Eute Self-assembled Islands

dc.creatorHeredia E.
dc.creatorDiaz B.
dc.creatorMalachias A.
dc.creatorRappl P.H.O.
dc.creatorIikawa F.
dc.creatorBrasil M.J.S.P.
dc.creatorMotisuke P.
dc.date2014
dc.date2015-06-25T17:53:26Z
dc.date2015-11-26T14:24:22Z
dc.date2015-06-25T17:53:26Z
dc.date2015-11-26T14:24:22Z
dc.date.accessioned2018-03-28T21:26:33Z
dc.date.available2018-03-28T21:26:33Z
dc.identifier
dc.identifierJournal Of Crystal Growth. , v. 386, n. , p. 139 - 145, 2014.
dc.identifier220248
dc.identifier10.1016/j.jcrysgro.2013.10.002
dc.identifierhttp://www.scopus.com/inward/record.url?eid=2-s2.0-84886703127&partnerID=40&md5=6e5abfb25f21a1fc73a7ab5f0c89ff26
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/86453
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/86453
dc.identifier2-s2.0-84886703127
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1245386
dc.descriptionEuTe is a magnetic semiconductor with potential applications in prototype optoelectronic and spintronic devices. In this work, we investigated the structural properties of EuTe grown on BaF2(111) substrates by molecular beam epitaxy. X-ray diffraction measurements were performed on two series of samples with different growth times and temperatures. The growth occurs in the Volmer-Webber mode, with initial formation of islands that then coalesce to form thin films. The islands size, mosaic spread, and strain state are deduced as a function of growth conditions. Surprisingly, the EuTe islands exhibit in-plane tensile strain, while compressive strain is expected for structures grown over a substrate with smaller lattice parameter. The islands tensile strain relaxes with increasing deposition times and substrate temperature, and it tends to zero for thick EuTe films. We propose that the EuTe/BaF2 lattice mismatch is compensated by the formation of interfacial misfit dislocations. The growth conditions out of equilibrium favor the formation of a metastable state with a high concentration of dislocations that over-compensates the original misfit. This is in agreement with the observed reduction of tensile strain as the substrate temperature increases. © 2013 Elsevier B.V.
dc.description386
dc.description
dc.description139
dc.description145
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dc.languageen
dc.publisher
dc.relationJournal of Crystal Growth
dc.rightsfechado
dc.sourceScopus
dc.titleAnomalous Strain Behavior On Eute Self-assembled Islands
dc.typeArtículos de revistas


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