Raman light scattering study and microstructural analysis of epitaxial films of the electron-doped superconductor La-2 (-x) Ce (x) CuO4

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dc.contributor.authorRahlenbeck, Men_AU
dc.contributor.authorWagenknecht, Men_AU
dc.contributor.authorTsukada, Aen_AU
dc.contributor.authorKoelle, Den_AU
dc.contributor.authorKleiner, Ren_AU
dc.contributor.authorKeimer, Ben_AU
dc.contributor.authorUlrich, Cen_AU
dc.date.accessioned2010-07-26T04:12:56Zen_AU
dc.date.available2010-07-26T04:12:56Zen_AU
dc.date.issued2010-06en_AU
dc.date.statistics2010-06en_AU
dc.description.abstractWe present a detailed temperature-dependent Raman light scattering study of optical phonons in molecular-beam-epitaxy-grown films of the electron-doped superconductor La2 -x Ce x CuO4 close to optimal doping (x ~ 0.08, T c = 29 K and x ~ 0.1, T c = 27 K). The main focus of this work is a detailed characterization and microstructural analysis of the films. Based on micro-Raman spectroscopy in combination with X-ray diffraction, energy-dispersive X-ray analysis, and scanning electron microscopy, some of the observed phonon modes can be attributed to micron-sized inclusions of Cu2O. In the slightly underdoped film (x ~ 0.08), both the Cu2O modes and others that can be assigned to the La2 -x Ce x CuO4 matrix show pronounced softening and narrowing upon cooling below T ~ T c . Based on control measurements on commercial Cu2O powders and on a comparison to prior Raman scattering studies of other high-temperature superconductors, we speculate that proximity effects at La2 -x Ce x CuO4/Cu2O interfaces may be responsible for these anomalies. Experiments on the slightly overdoped La2 -x Ce x CuO4 film (x ~ 0.1) did not reveal comparable phonon anomalies. © 2010, Springer.en_AU
dc.identifier.citationRahlenbeck, M., Wagenknecht, M., Tsukada, A., Koelle, D., Kleiner, R., Keimer, B., & Ulrich, C. (2010). Raman light scattering study and microstructural analysis of epitaxial films of the electron-doped superconductor La-2 (-x) Ce (x) CuO4. European Physical Journal B, 75(4), 461-467. doi:10.1140/epjb/e2010-00166-6en_AU
dc.identifier.govdoc1983en_AU
dc.identifier.issn1434-6028en_AU
dc.identifier.issue4en_AU
dc.identifier.journaltitleEuropean Physical Journal Ben_AU
dc.identifier.pagination461-467en_AU
dc.identifier.urihttp://dx.doi.org/10.1140/epjb/e2010-00166-6en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1884en_AU
dc.identifier.volume75en_AU
dc.language.isoenen_AU
dc.publisherSpringeren_AU
dc.subjectRaman effecten_AU
dc.subjectSuperconductorsen_AU
dc.subjectLight scatteringen_AU
dc.subjectPhononsen_AU
dc.subjectMolecular beam epitaxyen_AU
dc.subjectDoped materialsen_AU
dc.titleRaman light scattering study and microstructural analysis of epitaxial films of the electron-doped superconductor La-2 (-x) Ce (x) CuO4en_AU
dc.typeJournal Articleen_AU
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