Volume 64, Number 2, October 2003
|Page(s)||246 - 252|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 November 2003|
Far-infrared conductivity in electron-doped cuprate
Experimentalphysik V, EKM, Universität
Augsburg - 86135 Augsburg, Germany
2 General Physics Institute of the Russian Academy of Sciences 119991 Moscow, Russia
3 NTT Basic Research Laboratories - 3-1, Morinosato-Wakamiya Atsugi-shi, Kanagawa 243-0198, Japan
Accepted: 30 July 2003
We performed far-infrared and submillimeter-wave conductivity experiments in the electron-doped cuprate x with x=0.081 (underdoped regime, ). The onset of the absorption in the superconducting state is gradual in frequency and is inconsistent with the isotropic s-wave gap. Instead, a narrow quasiparticle peak is observed at zero frequency and a second peak at finite frequencies, clear fingerprints of the conductivity in a d-wave superconductor. A far-infrared conductivity peak can be attributed to , or to , where is the resonance frequency of the spin fluctuations. The infrared conductivity as well as the suppression of the quasiparticle scattering rate below are qualitatively similar to the results in the hole-doped cuprates.
PACS: 74.25.Gz – Optical properties / 74.78.Bz – High- films / 74.72.Dn – -based cuprates
© EDP Sciences, 2003
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