Ultrafast transient grating and pump probe measurements in optimally doped La$_{2-x}$Sr$_{x}$CuO$_{4}$ thin films

ORAL

Abstract

We have performed pump probe and transient grating measurements on high-T$_c$ thin films of optimally doped La$_{2-x}$Sr$_{x}$CuO$_{4}$. In these experiments, a pair of femtosecond pulses are interfered on the sample generating a sinusoidal intensity modulation that in turn induces a density grating of photoexcitations. The resulting change in reflectivity allows time-resolved optical measurement of the separate effects of recombination and diffusion. We describe the temperature and excitation density dependence of these measurements and discuss their implications on the nature of superconductivity in the cuprates.

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Authors

  • Darius Torchinsky

    • MIT
    • Department of Physics, Massachusetts Institute of Technology, Cambridge MA 02139

  • Fahad Mahmood

    • MIT
    • Department of Physics, Massachusetts Institute of Technology, Cambridge MA 02139

  • David Hsieh

    • MIT
    • Department of Physics, Massachusetts Institute of Technology, Cambridge MA 02139

  • James McIver

    • MIT
    • Department of Physics, Massachusetts Institute of Technology, Cambridge MA 02139

  • A. Bollinger

    • Brookhaven National Laboratory

  • I. Bozovic

    • Brookhaven National Laboratory

  • Nuh Gedik

    • Massachusetts Institute of Technology
    • MIT
    • Department of Physics, MIT, Cambridge, MA 02139
    • Department of Physics, Massachusetts Institute of Technology, Cambridge MA 02139