Character of charge transfer excitons in Sr2CuO2Cl2 / Moskvin AS,Neudert R,Knupfer M,Fink J,Hayn R // PHYSICAL REVIEW B. - 2002. - V. 65, l. 18.

ISSN/EISSN:

2469-9950 / 2469-9969

Type:

Article

Abstract:

High resolution electron energy loss spectroscopy (EELS) measurements of the insulating, layered cuprate compound Sr2CuO2Cl2 have been performed with a transferred momentum near k=0 and in a wide energy range up to 20 eV. To interpret the data a semiquantitative embedded cluster approach is applied to describe the electron-hole excitations in insulating cuprates. The theory includes the complete set of Cu 3d and O 2p orbitals and predicts a rather wide (2/13 eV) spectral range of the main dipole-allowed one- and two-center charge transfer (CT) transitions whose positions are in good quantitative agreement with the experimental spectra. Both, theory and the experimental data show that the CT gap is determined by a superposition of nearly degenerate one-center, localized CT excitations and two-center CT excitons with sizable dispersion.

Author keywords:

ENERGY-LOSS SPECTROSCOPY; DYNAMICS; SPECTRUM; PLANE

DOI:

10.1103/PhysRevB.65.180512

Web of Science ID:

ISI:000175758700026

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	MAY 1
Publisher	AMER PHYSICAL SOC
Address	ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Language	English
Article-Number	180512
EISSN	2469-9969
Keywords-Plus	ENERGY-LOSS SPECTROSCOPY; DYNAMICS; SPECTRUM; PLANE
Research-Areas	Physics
Web-of-Science-Categories	Physics, Condensed Matter
ResearcherID-Numbers	Fink, Joerg/A-6003-2012
Number-of-Cited-References	15
Usage-Count-Last-180-days	2
Usage-Count-Since-2013	7
Journal-ISO	Phys. Rev. B
Doc-Delivery-Number	554VW