| Issue |
Europhys. Lett.
Volume 70, Number 2, April 2005
|
|
|---|---|---|
| Page(s) | 225 - 231 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2004-10480-2 | |
| Published online | 18 March 2005 | |
Infrared properties of electron-doped cuprates:
Tracking normal-state gaps and quantum critical behavior
in 
x
1
Laboratoire de Physique du Solide (UPR 5 CNRS) ESPCI 10 rue Vauquelin, 75005 Paris, France
2
Center for Superconductivity Research, Department of Physics University of Maryland - College Park, MD 20742, USA
3
Physics Department, Columbia University - New York, NY 10027, USA
4
Department of Physics, Brookhaven National Laboratory Upton, NY 11973, USA
Corresponding author: lobo@espci.fr
Received:
30
November
2004
Accepted:
25
February
2005
We report the temperature dependence of the infrared-visible
conductivity of x thin
films. When varying the doping from a non-superconducting film
(
) to a superconducting overdoped film (
), we
observe, up to optimal doping (
), a partial gap
opening. The magnitude of this gap extrapolates to zero for
. A model combining a spin density wave gap and a
frequency- and temperature-dependent self-energy reproduces our
data reasonably well, suggesting the coexistence of magnetism and
superconductivity in this material and the existence of a quantum
critical point at this concentration.
PACS: 74.25.Gz – Optical properties / 74.72.Jt – Other cuprates, including Tl and Hg-based cuprates / 75.30.Fv – Spin-density waves
© EDP Sciences, 2005
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