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We performed far-infrared and submillimeter-wave conductivity experiments inthe electron-doped cuprate La_{2-x}Ce_xCuO_4 with x = 0.081 (underdoped regime,T_c = 25 K). The onset of the absorption in the superconducting state isgradual in frequency and is inconsistent with the isotropic s-wave gap.Instead, a narrow quasiparticle peak is observed at zero frequency and a secondpeak at finite frequencies, clear fingerprints of the conductivity in a d-wavesuperconductor. A far-infrared conductivity peak can be attributed to 4Delta_0,or to 2Delta_0 + Delta_spin, where Delta_spin is the resonance frequency of thespin-fluctuations. The infrared conductivity as well as the suppression of thequasiparticle scattering rate below T_c are qualitatively similar to theresults in the hole-doped cuprates.Comment: 5 pages, 4 figures include

Far-infrared conductivity in electron-doped cuprate La 2 − x Ce x CuO 4

Far-infrared conductivity in electron-doped cuprate La _{2 − x} Ce _x CuO ₄