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Optical Study of the Stripe-Ordered State
The effects of the stripe order on the optical spectra of La-based cuprates
are reviewed. The main effect on the high Tc superconducting cuprates is to
rapidly reduce the Josephson plasma frequency in the c-axis spectrum as a
consequence of weakening of the Josephson coupling between CuO2 layers. This
points toward a two dimensional (2D) superconductivity in the stripe phase,
although it is difficult to realize a 2D superconductivity in real materials.
We also discuss the experimental results suggesting the presence of stripe
effect in other cuprates even if they do not show the static stripe phase.
Compared to the c-axis spectra, the in-plane spectra are not so dramatically
affected by the stripe order, showing a weak gap-like feature and reducing the
condensate spectral weight.Comment: in press, Physica C(2012