Two types of charge transfer excitations in low dimensional cuprates: an electron energy-loss study / Knupfer M,Fink J,Drechsler SL,Hayn R,Malek J,Moskvin AS // JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA. - 2004. - V. 137, l. SI. - P. 469-473.

ISSN/EISSN:

0368-2048 / 1873-2526

Type:

Article; Proceedings Paper

Abstract:

Electron energy-loss spectroscopy in transmission has been used to study the electronic excitations near the excitation onset of a number of low dimensional cuprate structures. It is shown that the spectral weight of the lowest lying charge transfer excitation significantly depends upon the dimensionality of the cuprate network, i.e., on the degree of delocalization of the involved electronic states. Furthermore, a detailed analysis of the lowest lying charge transfer excitation as a function of momentum and polarization reveals convincing evidence for the existence of two different types of charge transfer excitation located near the spectral onset. This can only be modelled with the inclusion of Cu and O orbitals beyond the standard pdo extended Hubbard model which is widely used for the description of electronic properties of Cu-O networks. To the best of our knowledge this is the first experimental manifestation for the relevance of orbitals beyond the standard extended Hubbard model for the low-energy excitations in a cuprate. (C) 2004 Elsevier B.V. All rights reserved.

Author keywords:

cuprates; electronic excitations; electron energy-loss spectroscopy PI-CONJUGATED SYSTEMS; LOSS SPECTROSCOPY; HOLE; EXCITONS; SUPERCONDUCTORS; SR2CUO2CL2; SYMMETRY; DYNAMICS; LI2CUO2; PLANE

DOI:

10.1016/j.elspec.2004.02.080

Web of Science ID:

ISI:000222251900073

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	JUL
Note	9th International Conference on Electronic Spectroscopy and Structure, Uppsala, SWEDEN, JUN 30-JUL 04, 2003
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
EISSN	1873-2526
Keywords-Plus	PI-CONJUGATED SYSTEMS; LOSS SPECTROSCOPY; HOLE; EXCITONS; SUPERCONDUCTORS; SR2CUO2CL2; SYMMETRY; DYNAMICS; LI2CUO2; PLANE
Research-Areas	Spectroscopy
Web-of-Science-Categories	Spectroscopy
Author-Email	m.knupfer@ifw-dresden.de
ResearcherID-Numbers	Malek, Jiri/G-7223-2014 Fink, Joerg/A-6003-2012
Number-of-Cited-References	29
Usage-Count-Since-2013	6
Journal-ISO	J. Electron Spectrosc. Relat. Phenom.
Doc-Delivery-Number	832FF