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.

引用

页数：4

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