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Science 30 April 2004:
Vol. 304. no. 5671, pp. 708 - 710
DOI: 10.1126/science.1095532
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Reports

In-Plane Spectral Weight Shift of Charge Carriers in YBa2Cu3O6.9

A. V. Boris,* N. N. Kovaleva,{dagger} O. V. Dolgov, T. Holden,{ddagger} C. T. Lin, B. Keimer, C. Bernhard

The temperature-dependent redistribution of the spectral weight of the CuO2 plane–derived conduction band of the YBa2Cu3O6.9 high-temperature superconductor (superconducting transition temperature = 92.7 kelvin) was studied with wide-band (0.01– to 5.6–electron volt) spectroscopic ellipsometry. A superconductivity-induced transfer of the spectral weight involving a high-energy scale in excess of 1 electron volt was observed. Correspondingly, the charge carrier spectral weight was shown to decrease in the superconducting state. The ellipsometric data also provide detailed information about the evolution of the optical self-energy in the normal and superconducting states.

Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.



{dagger} Also at the Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow district, 142432 Russia.

{ddagger} Present address: Department of Physics, Brooklyn College of the City University of New York, Brooklyn, NY 11210, USA.

* To whom correspondence should be addressed. E-mail: A.Boris{at}fkf.mpg.de

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Science. ISSN 0036-8075 (print), 1095-9203 (online)