| Issue |
Europhys. Lett.
Volume 64, Number 2, October 2003
|
|
|---|---|---|
| Page(s) | 246 - 252 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2003-00501-8 | |
| Published online | 01 November 2003 | |
Far-infrared conductivity in electron-doped cuprate
1
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
Received:
14
April
2003
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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