1. Femtosecond thermomodulation study of high-Tc superconductors
- Author
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S.D. Brorson, A. Kazeroonian, D.W. Face, T.K. Cheng, G.L. Doll, M.S. Dresselhaus, G. Dresselhaus, E.P. Ippen, T. Venkatesan, X.D. Wu, and A. Inam
- Subjects
chemistry.chemical_classification ,Superconductivity ,High-temperature superconductivity ,Materials science ,Condensed matter physics ,Transition temperature ,Fermi level ,Inorganic chemistry ,General Chemistry ,Condensed Matter Physics ,law.invention ,symbols.namesake ,chemistry ,law ,Femtosecond ,Materials Chemistry ,symbols ,Thin film ,Inorganic compound ,Excitation - Abstract
We present the first femtosecond pump-prove measurements of the room temperature optical properties of high-Tc superconductors. Three oriented superconducting thin-films were studied: YBa2Cu3O7−δ, Bi2Sr2CaCu2O8+z, and Bi2Sr2Ca2Cu3O10+y. The observed changes in e2 can be related to the dynamics of the Cu d to O p band charge transfer excitation occurring in the Cu O planes. By depleting the YBa2Cu3O7−δ sample of oxygen, we simultaneously vary the Fermi level and the Tc. The sign of Δe2 is found to depend on the Fermi level position, while the recovery time is found to increase markedly with decreasing Tc.
- Published
- 1990
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