Optical conductivity of exfoliated Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ nanocrystals

ORAL

Abstract

We report on infrared spectromicroscopy of mechanically exfoliated under-doped and optimally-doped Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ thin crystals on SiO$_2$/Si substrates. The infrared reflectance and transmission was measured for samples of various thicknesses and the the optical conductivity extracted in the frequency range 0.15 eV to 1 eV. Trends in the optical conductivity with thickness are discussed. In particular, we observe that the conductivity of thicker ($\sim$ 100 nm) samples is comparable to bulk while that of thinner ($\sim$ 20 nm) samples is markedly suppressed.

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Authors

  • Luke Sandilands

    • University of Toronto, Canada

  • Viktoriya Baydina

    • University of Toronto, Canada

  • Alexander Su

    • University of Toronto, Canada

  • Anjan Reijnders

    • University of Toronto, Canada

  • Tor Pedersen

    • Canadian Light Source, Canada

  • Ferenc Borondics

    • Canadian Light Source, Canada

  • Genda Gu

    • Brookhaven National Laboratory, USA

  • Shimpei Ono

    • University of Tokyo, Japan

  • Yoichi Ando

    • Osaka University, Japan

  • Kenneth Burch

    • Institute for Optical Sciences, University of Toronto, Canada