Volume 70, Number 2, April 2005
|Page(s)||225 - 231|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||18 March 2005|
Infrared properties of electron-doped cuprates: Tracking normal-state gaps and quantum critical behavior in x
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: email@example.com
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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