Raman scattering studies of ultrathin-layer YBa2Cu3O7/PrBa2Cu3O7 superlattices |
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Authors: | R Li R Feile G Jakob Th Hahn and H Adrian |
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Affiliation: | (1) Institut für Physik, Johannes-Gutenberg-Universität Mainz, D-55099 Mainz, Germany;(2) Institut für Festkörperphysik, TH-Darmstadt, D-64289 Darmstadt, Germany |
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Abstract: | We present Raman scattering studies ofc-oriented ultrathin-layer superconducting (YBa2Cu3O7)
m
/(PrBa2Cu3O7)
n
superlattices. For the superlattice with (m=2,n=1) sequence, Raman spectra reveal a new line in the spectral region around 320 cm–1. It is interpreted as a mode representing a combination of IR optical phonons of the Y-sublayers with an admixture of aB
1g type Raman active vibration in the Pr sublayers. This new line, which is similar to those from the interior of the Brillouin zone of the original lattice, does not exhibit superconductivity-induced self-energy effects, although its counterpart in the pure substance does. No additional line is found in the (m=1,n=2) superlattice in the same region, supporting our interpretation for the (m=2,n=1) sample. |
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Keywords: | Raman scattering superlattice YBa2Cu3O7 PrBa2Cu3O7 phonon renormalization |
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