Strain effects on La0.5Ca0.5MnO3 thin films

Antonakos, A; Liarokapis, E; Aydogdu, GH; Habermeier, H-U

dc.contributor.author	Antonakos, A	en
dc.contributor.author	Liarokapis, E	en
dc.contributor.author	Aydogdu, GH	en
dc.contributor.author	Habermeier, H-U	en
dc.date.accessioned	2014-03-01T01:27:18Z
dc.date.available	2014-03-01T01:27:18Z
dc.date.issued	2007	en
dc.identifier.issn	0921-5107	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/18388
dc.subject	Colossal magnetoresistance	en
dc.subject	Manganites	en
dc.subject	Raman scattering	en
dc.subject	Strains	en
dc.subject	Thin films	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	Colossal magnetoresistance	en
dc.subject.other	Magnetite	en
dc.subject.other	Polarization	en
dc.subject.other	Raman spectroscopy	en
dc.subject.other	Strain measurement	en
dc.subject.other	Substrates	en
dc.subject.other	Superconducting transition temperature	en
dc.subject.other	LCMO	en
dc.subject.other	Room temperature	en
dc.subject.other	Strain effects	en
dc.subject.other	Tilting angle	en
dc.subject.other	Thin films	en
dc.title	Strain effects on La0.5Ca0.5MnO3 thin films	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.mseb.2007.07.013	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.mseb.2007.07.013	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	Thin films of La0.5Ca0.5MnO3 (LCMO) deposited on SrTiO3 (STO) with orientations (1 0 0) and (1 1 1) and on (0 0 1) SrLaGaO4 (SLGO) substrates have been studied by Raman spectroscopy. Three different thicknesses for each substrate were studied at room temperature. The energy and the width of the Ag tilting mode have shown thickness and substrate dependence, implying an effect of the lattice mismatch on the tilting angle. Low temperature measurements (80 K) have been carried out at different scattering polarizations for the thicker films (290 nm). The spectra of LCMO/STO(1 0 0) films are strongly affected by the paramagnetic to ferromagnetic (FM) or charge ordered (CO) antiferromagnetic (AF) transitions. The Jahn-Teller (JT) modes gain intensity close to the transition temperature, where a considerable softening of the tilting mode has been also observed. New bands appear below Neel temperature (TN) for LCMO/STO(1 0 0), while this transition cannot be observed on the other films. A possible explanation is the phase coexistence which is discovered at the FM to CO/AF region (210-150 K) for LCM/STO(1 0 0) films. However, a strain effect seems to destroy the FM phase on contrary to the bulk. The JT modes do not appear (partially hidden by the spectrum of the substrate) in the spectra of LCMO/STO(1 1 1) films, which show a metallic-like spectrum, consistent with the resistivity measurements. The JT distortion appears decreased in LCMO/SLGO(0 0 1) films and the transition temperatures are affected from the strains. © 2007 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE SA	en
heal.journalName	Materials Science and Engineering B: Solid-State Materials for Advanced Technology	en
dc.identifier.doi	10.1016/j.mseb.2007.07.013	en
dc.identifier.isi	ISI:000251744600018	en
dc.identifier.volume	144	en
dc.identifier.issue	1-3	en
dc.identifier.spage	83	en
dc.identifier.epage	88	en