7 November 2002 Femtosecond optical studies of cuprates
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Femtosecond optical reflectivity measurements of La2-xSrxCuO4, La2CuO4+y, Bi2Sr2CuO6+z and Bi2Sr2CaCu2O8+δ thin films and single crystal samples indicate qualitative changes with fluence. At the lowest fluencies, there is a power law divergence in the relaxation time. The divergence has an onset temperature of 55±15K, independent of whether the sample is in the superconducting or normal states. At slightly higher fluencies, still perturbative, the additional response does not exhibit this power law divergence. At quite high fluencies- no longer perturbative- the metallic samples exhibit oscillations in the reflectivity amplitude. The period of these oscillations varies with the probe wavelength but not with the pump wavelength. The oscillations exhibit a decay time as long as 10 nsec.
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Michael L. Schneider, S. Rast, Marshall Onellion, Jure Demsar, Antoinette J. Taylor, Yu D. Glinka, Norman H. Tolk, Yuhang Ren, Gunter Luepke, A. Klimov, Ying Xu, Roman Sobolewski, Weidong Si, X. H. Zeng, A. Soukiassian, Xiaoxing Xi, M. Abrecht, Daniel Ariosa, Davor Pavuna, Recardo Manzke, J. O. Printz, D. K. Parkhurst, K. E. Downum, P. Guptasarma, Ivan Bozovic, "Femtosecond optical studies of cuprates", Proc. SPIE 4811, Superconducting and Related Oxides: Physics and Nanoengineering V, (7 November 2002); doi: 10.1117/12.453707; https://doi.org/10.1117/12.453707

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