Infrared properties of electron-doped cuprates: Tracking normal-state gaps and quantum critical behavior in Pr2 − xCexCuO4
Infrared properties of electron-doped cuprates: Tracking normal-state gaps and quantum critical behavior in Pr2 − xCexCuO4
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DOI：
10.1209/epl/i2004-10480-2
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发表时间：
2004-06
期刊：
影响因子：
1.8
通讯作者：
A. Zimmers;J. Tomczak;R. Lobo;N. Bontemps;C. P. Hill;M. Barr;Y. Dagan;R. Greene;A. Millis;C. Homes
中科院分区：
文献类型：
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作者：
A. Zimmers;J. Tomczak;R. Lobo;N. Bontemps;C. P. Hill;M. Barr;Y. Dagan;R. Greene;A. Millis;C. Homes
我们报告的温度依赖性的Pr 2 − xCexCuO 4薄膜的红外-可见光电导率。当从非超导膜（x = 0.11）到超导过掺杂膜（x = 0.17）改变掺杂时，我们观察到，直到最佳掺杂（x = 0.15），部分间隙开口。对于x ~ 0.17，该间隙的大小外推到零。结合自旋密度波隙和依赖于频率和温度的自能的模型再现我们的数据相当不错，这表明在这种材料中的磁性和超导性的共存，并存在一个量子临界点在这个Ce浓度。
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 ~ 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.