Femtosecond Absorption Studies of Nonequilibrium Electronic Processes in High-Tc Superconductors

J. Chwalek; C. Uher; S. Gupta; J. Whitaker; J. Agostinelli; M. Lelental

doi:10.1364/UP.1990.WF2

Ultrafast Phenomena
Technical Digest Series (Optica Publishing Group, 1990),
paper WF2
•https://doi.org/10.1364/UP.1990.WF2

Femtosecond Absorption Studies of Nonequilibrium Electronic Processes in High-T_c Superconductors

J. Chwalek, C. Uher, S. Gupta, J. Whitaker, J. Agostinelli, and M. Lelental

International Conference on Ultrafast Phenomena 1990

Monterey, California United States
14–17 May 1990
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Superconductors (WF)

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J. Chwalek, C. Uher, S. Gupta, J. Whitaker, J. Agostinelli, and M. Lelental, "Femtosecond Absorption Studies of Nonequilibrium Electronic Processes in High-Tc Superconductors," in Ultrafast Phenomena, Technical Digest Series (Optica Publishing Group, 1990), paper WF2.

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Abstract

The time resolution of nonequilibrium electron processes using short laser pulses has produced important information regarding the thermal properties of the carriers and phonons in metals¹-². Recently the use of short laser pulses (~ 8 ps) has been used to study the electron-phonon relaxation rate in single crystal, non-superconducting lanthanum cuprate³. The authors found nonequilibrium heating to occur on a picosecond time scale. In this paper we present for the first time, evidence of nonequilibrium heating on a single picosecond time scale in epitaxial thin-film samples of the compounds YBa₂Cu₃O_7-x (0 < x < 0.6) and Bi₂Sr₂Ca₂Cu₃O₁₀.

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