Infrared properties of electron-doped cuprates: Tracking normal-state gaps and quantum critical behavior in Pr <sub> 2 − <i>x</i> </sub> Ce <sub> <i>x</i> </sub> CuO <sub>4</sub>
A. ZimmersLaboratoire de Physique du Solide (UPR 5 CNRS) ESPCI 10 rue Vauquelin, 75005 Paris, FranceJan M. TomczakLaboratoire de Physique du Solide (UPR 5 CNRS) ESPCI 10 rue Vauquelin, 75005 Paris, FranceR. P. S. M. LoboLaboratoire de Physique du Solide (UPR 5 CNRS) ESPCI 10 rue Vauquelin, 75005 Paris, FranceN. BontempsLaboratoire de Physique du Solide (UPR 5 CNRS) ESPCI 10 rue Vauquelin, 75005 Paris, FranceC. HillCenter for Superconductivity Research, Department of Physics University of Maryland - College Park, MD 20742, USAM. C. BarrCenter for Superconductivity Research, Department of Physics University of Maryland - College Park, MD 20742, USAY. DaganCenter for Superconductivity Research, Department of Physics University of Maryland - College Park, MD 20742, USAR. L. GreeneCenter for Superconductivity Research, Department of Physics University of Maryland - College Park, MD 20742, USAAndrew J. MillisPhysics Department, Columbia University - New York, NY 10027, USAC. C. HomesDepartment of Physics, Brookhaven National Laboratory Upton, NY 11973, USA
2005en
ABI
Аннотация
We report the temperature dependence of the infrared-visible conductivity of Pr(2-x)Ce(x)CuO(4) 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. A model combining a spin density wave gap and a frequency and temperature dependent self energy reproduces our data reasonably well. The magnitude of this gap extrapolates to zero for x ~ 0.17 indicating 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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