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|Title: ||Raman light scattering study and microstructural analysis of epitaxial films of the electron-doped superconductor La-2 (-x) Ce (x) CuO4.|
|Authors: ||Rahlenbeck, M|
|Keywords: ||Raman Effect|
Molecular Beam Epitaxy
|Issue Date: ||Jun-2010|
|Citation: ||Rahlenbeck, M., Wagenknecht, M., Tsukada, A., Koelle, D., Kleiner, R., Keimer, B., et al. (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.|
|Abstract: ||We 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. The original publication is available at www.springerlink.com|
|Appears in Collections:||Journal Articles|
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