Infrared properties of La2x(Ca,Sr)xCaCu2O6+δ single crystals

N. L. Wang, P. Zheng, T. Feng, G. D. Gu, C. C. Homes, J. M. Tranquada, B. D. Gaulin, and T. Timusk
Phys. Rev. B 67, 134526 – Published 30 April 2003
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Abstract

The in-plane optical properties of two crystals of the bilayer cuprate La2x(Ca,Sr)xCaCu2O6+δ, one with excess Ca and x=0.10 and the other with Sr and x=0.15, were investigated over the frequency range of 45–25000cm1. The optical conductivity has been derived from Kramers-Kronig transformation. Each crystal exhibits a peak at around 15000cm1, which corresponds to the charge-transfer (CT) excitation of the parent insulator. With increasing carrier density, spectral weight shifts from the CT excitation to the low-ω region. For the superconducting sample (x=0.15), the optical conductivity displays a peak in the far-infrared region, which shifts toward zero frequency with decreasing temperature. The temperature-dependent behavior favors a dynamical localization picture. A “pseudogap” feature is observed in the low-frequency reflectance and the scattering rate spectra. Both the energy scale and the temperature dependence of the pseudogap are similar to other bilayer cuprates.

  • Received 8 November 2002

DOI:https://doi.org/10.1103/PhysRevB.67.134526

©2003 American Physical Society

Authors & Affiliations

N. L. Wang1,*, P. Zheng1, T. Feng1, G. D. Gu2, C. C. Homes2, J. M. Tranquada2, B. D. Gaulin3, and T. Timusk3

  • 1Institute of Physics, Chinese Academy of Sciences, P. O. Box 603, Beijing 100080, People’s Republic of China
  • 2Department of Physics, Brookhaven National Laboratory, P. O. Box 5000, Upton, New York 11973-5000
  • 3Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1

  • *Electronic address: nlwang@aphy.iphy.ac.cn

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Vol. 67, Iss. 13 — 1 April 2003

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