Femtosecond optical measurements of the position of the Fermi level in Y-Ba-Cu-O films with different oxygen contents

Roman Sobolewski; T. Gong; Y. Kostoulas; W. Xiong; W. Kula; P. M. Fauchet

Quantum Electronics and Laser Science Conference
OSA Technical Digest (Optica Publishing Group, 1993),
paper QTuF6

Femtosecond optical measurements of the position of the Fermi level in Y-Ba-Cu-O films with different oxygen contents

Roman Sobolewski, T. Gong, Y. Kostoulas, W. Xiong, W. Kula, and P. M. Fauchet

Quantum Electronics and Laser Science Conference 1993

Baltimore, Maryland United States
2–7 May 1993
ISBN: 1-55752-302-9

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Ultrafast Phenomena in Condensed Matter (QTuF)

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R. Sobolewski, T. Gong, Y. Kostoulas, W. Xiong, W. Kula, and P. M. Fauchet, "Femtosecond optical measurements of the position of the Fermi level in Y-Ba-Cu-O films with different oxygen contents," in Quantum Electronics and Laser Science Conference, D. Auston, D. Steel, T. Heinz, and G. Stegeman, eds., Vol. 12 of OSA Technical Digest (Optica Publishing Group, 1993), paper QTuF6.

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Abstract

The carrier dynamics in high-temperature superconductors (HTS) have been recently studied by femtosecond pump-probe experiments. In particular, room-temperature femtosecond time-resolved measurements of differential reflectivity ΔR/R at 2 eV (Refs. 1 and 2) hinted that there must be a difference in the Fermi-level E_f positions between the oxygen-rich and oxygen-poor YBa₂−Cu₃−O_x (YBCO) thin films. The determination of the exact position of E_f in the HTS materials is very important since it should shed a new light on the origin of superconductivity in these materials.

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