Anisotropic Optical Conductivity of Nd2-xCexCuO4 Thin Films
Takashi Yanagisawa, Shigeru Koikegami, Hajime Shibata, Shinji Kimura, Satoshi Kashiwaya, Akihito Sawa, Noritaka Matsubara, Koki Takita
Abstract
Opticcal conductivity spectra σ1(ω) 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 σ1 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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