Anisotropic Optical Conductivity of Nd2-xCexCuO4 Thin Films

Details Anisotropic Optical Conductivity of Nd2-xCexCuO4 Thin Films Anisotropic Optical Conductivity of Nd2-xCexCuO4 Thin Films

2002-04-15

arxiv.org/abs/cond-mat/0204316v1

Journal of the Physical Society of Japan 70 (2001) 2833

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

Opticcal conductivity spectra $\sigma_1(\omega)$ of Nd2-xCexCuO4 thin films, measured by the reflectance-transmittance method (R-T method) which has been proposed to investigate far-infrared spectroscopy, are investigated based on the anisotropic pairing model. Precise measurements of the frequency-dependent conductivity enable us to examine quantitatively the nature of the superconducting gap through infrared properties in the electron-doped high-Tc superconductors. We show that the behavior of optical conductivity $\sigma_1$ is consistent with the anisotropic superconducting gap and is well explained by the formula for d-wave pairing in the low-energy regime of the far-infrared region. Our results suggest that the electron-doped cuprate superconductors Nd2-xCexCuO4 have nodes in the superconducting gap.

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