Comment on ''Phase Diagram of La${}_{2-x}$Sr${}_x$CuO${}_4$ Probed in the Infrared: Imprints of Charge Stripe Excitations''

Abstract

Recently Lucarelli {\it et al.} have reported\cite{lucarelli} temperature-dependence of the in-plane optical reflectivity of La${}_{2-x}$Sr${}_x$CuO${}_4$ over a wide doping range, focusing on the infrared peaks at 30 cm${}^{-1}$ (for $x$=0.12), 250 cm${}^{-1}$ and 510 cm${}^{-1}$. They interpreted the first peak (30 cm${}^{-1}$) as a signature of charge stripe ordering, while the latter two (250 cm${}^{-1}$ and 510 cm${}^{-1}$) are attributed to the polaronic charge excitations. However, careful readers would notice that the reported spectra are largely different from those so far measured on the same system. As we illustrate below, all these peaks are caused by an uncontrolled leakage of the c-axis reflectivity into the measured spectra.

arXiv comment1 page, 1 figure, accepted for publication in Phys. Rev. Lett 91 (2003)

References in corpus (3)

• Infrared signatures of charge stripes in La(2-x)Sr(x)CuO(4)
• Grazing Incidence Infrared Reflectivity of La${}_{1.85}$Sr${}_{0.15}$CuO${}_4$ and NbN
• On the peak in the far-infrared conductivity of strongly anisotropic cuprates

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• Determination of the optical properties of La{2-x}Ba{x}CuO{4} for several dopings, including the anomalous x=1/8 phase
• Infrared signatures of hole and spin stripes in La{2-x}Sr{x}CuO{4}
• In-plane optical conductivity of La${}_{2-x}$Sr${}_x$CuO${}_4$: Reduced superconducting condensate and residual Drude-like response
• The composite picture of the charge carriers in La2-xSrxCuO4 (0.063 < x < 0.11) superconductors
• Reflectivity measurements in uniaxial superconductors: a methodological discussion applied to the case of La(2-x)Sr(x)CuO(4)