Charge-transfer excitons in underdoped Ca2-xNaxCuO2Cl2 studied by electron energy-loss spectroscopy

被引：8
|
作者：
Schuster, R. [1 ]
Pyon, S. [2 ]
Knupfer, M. [1 ]
Fink, J. [1 ,3 ]
Azuma, M. [4 ]
Takano, M. [4 ]
Takagi, H. [2 ]
Buechner, B. [1 ]
机构：
[1] IFW Dresden, Inst Solid State Res, D-01171 Dresden, Germany
[2] Univ Tokyo, Dept Adv Mat Sci, Chiba 2778581, Japan
[3] Helmholtz Zentrum Berlin Mat & Energie, D-12489 Berlin, Germany
[4] Kyoto Univ, Inst Chem Res, Uji, Kyoto 6110011, Japan
来源：
PHYSICAL REVIEW B | 2009年 / 79卷 / 21期
关键词：
antiferromagnetism; calcium compounds; charge transfer states; doping; electron energy loss spectra; electronic structure; excitons; high-temperature superconductors; sodium compounds; SR2CUO2CL2; EXCITATIONS; CA2CUO2CL2; SCATTERING; CRYSTALS; PLANE;
D O I：
10.1103/PhysRevB.79.214517
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Employing electron energy-loss spectroscopy we show that small values of doping in the system Ca2-xNaxCuO2Cl2 strongly influence the formation of charge-transfer excitons in the Cu-O plane. We find a remarkable redistribution of spectral weight between the two modes-a bound exciton and a continuum state-seen in the insulator yielding a single sharp feature for nonzero doping accompanied by a strong suppression of the dispersion. Our data may provide evidence for a prominent role of the magnetic background on the dynamics of charge-transfer excitations in underdoped cuprates.
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页数：4
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