Decoupling excitations in the far-infrared spectra of a {ital c}-axis YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} single crystal
- Centre de Recherches sur la Physique des Hautes Temperatures, CNRS, 45071 Orleans, Cedex 2 (France)
The infrared reflection spectra of a YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} single-crystal 5{times}7-mm{sup 2} surface containing the {ital c} axis have been recorded from 4 K to room temperature. The spectra obtained for different values of {delta} with the same sample show unambiguously that an extra band, coupled with phonons, appears at low frequencies in the superconducting phase. By decoupling this excitation from the other contributions to the dielectric function, we show that the thermal evolution of the extra band follows the expected behavior for the superconducting order parameter. The excitation energy is characteristic of Cooper pairs formation. The residual low-frequency optical conductivity in the superconducting state is discussed. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 434496
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 53, Issue 1; Other Information: PBD: Jan 1996
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BARIUM OXIDES
INFRARED SPECTRA
COPPER OXIDES
YTTRIUM OXIDES
COOPER PAIRS
FAR INFRARED RADIATION
HIGH-TC SUPERCONDUCTORS
KRAMERS-KRONIG CORRELATION
MONOCRYSTALS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K