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Fourier transform Raman spectroscopy of superconducting YBa 2 Cu 3 O 7‐δ films on strontium titanate and magnesium oxide substrates
Author(s) -
Bist H. D.,
Datta T.,
Little T. S.,
Thigpen J. C.,
Durig J. R.,
Broussard P. R.,
Berkley D. D.
Publication year - 1991
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250221108
Subject(s) - raman spectroscopy , strontium titanate , materials science , analytical chemistry (journal) , raman scattering , spectroscopy , oxide , crystallite , superconductivity , thin film , chemistry , condensed matter physics , optics , metallurgy , nanotechnology , physics , chromatography , quantum mechanics
Thin sputtered films of the high‐ T c material YBa 2 Cu 3 O 7‐Δ were investigated using 180° back‐scattering geometry with Fourier transform (FT) Raman spectroscopy. It is established that the main bands in the spectra of a YBa 2 Cu 3 O 7‐Δ film on strontium titanate substrate exhibit similarity with those obtained for oriented untwinned crystallites of the superconductor having their c ‐axis perpendicular to the surface of the substrate. No degradation or excessive heating of the film was observed with 1.064 μm excitation for low laser powers. The film on a magnesium oxide substrate gives unique evidence of the isolated strong, featureless, almost flat continuum, producing a broad maximum near the region of the antiphase axial bending O(2)Cu(2)O(3) motions of planar oxygens at very low excitation energy. This appears to be the first application of FT‐Raman spectroscopy using near‐infrared excitation (1.064 μm) to the field of high‐temperature superconducting films and their detailed characterization.