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Electro-optic sampling of picosecond photoresponse of epitaxial YBa2Cu3O7-δ thin films

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The origin of the fast photoresponse observed below Tc from current-biased YBa2Cu3O7-δ (YBCO) superconducting thin films has been a source of controversy for several years now.1-6 The photoresponse signals have been attributed to either bolometric (thermal or equilibrium) or nonbolometric (nonthermal or nonequilibrium) mechanisms. A variety of nonbolometric mechanisms have been proposed to explain the fast transients, such as nonequilibrium electron heating1 and nonequilibrium-induced changes in the kinetic inductance of the YBCO bridge.2,3,6

© 1995 Optical Society of America

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