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Optical properties of YBa$_2$Cu$_3$O$_7 - \delta$ and PrBa$_2$Cu$_3$O$_7 - \delta$ films: High-energy correlations and metallicity
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2004 (English)In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 70, no 17Article in journal (Refereed) Published
Abstract [en]

We have investigated the temperature dependence of the dielectric functions of a high-Tc superconducting YBa2Cu3O7-- (Y-123) and a nonsuperconducting PrBa2Cu3O7-- (Pr-123) thin film using spectral ellipsometry. We evaluate the data by means of thermal-difference and sum-rule analysis techniques. We find that a spectral-weight transfer into the bands between 4 and 5 eV takes place before Y-123 becomes superconducting. We identify an anomaly around 1 eV that can be explained by a sudden plasma-frequency drop of the order of an meV around Tc. The absence of any sudden effects in the dielectric properties of Pr-123 suggests that both observations are intimately related to the superconducting state. Our findings point out that high-energy degrees of freedom must be considered for the understanding of high-temperature superconductivity.

Place, publisher, year, edition, pages
2004. Vol. 70, no 17
Keyword [en]
yttrium compounds, barium compounds, praseodymium compounds, high-temperature superconductors, superconducting thin films, ellipsometry, dielectric function, superconducting transitions, spectral line breadth
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:miun:diva-14334DOI: 10.1103/PhysRevB.70.174502OAI: oai:DiVA.org:miun-14334DiVA: diva2:435729
Available from: 2011-08-19 Created: 2011-08-19 Last updated: 2011-11-27Bibliographically approved

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Bäckström, Joakim
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