期刊
EUROPHYSICS LETTERS
卷 70, 期 2, 页码 225-231出版社
EDP SCIENCES S A
DOI: 10.1209/epl/i2004-10480-2
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We report the temperature dependence of the infrared-visible conductivity of Pr2-xCexCuO4 thin films. When varying the doping from a non-superconducting film (x = 0.11) to a superconducting overdoped film (x = 0.17), we observe, up to optimal doping (x = 0.15), a partial gap opening. The magnitude of this gap extrapolates to zero for x similar to 0.17. 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 Ce concentration.
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