Low-energy charge excitations in an undoped cuprate: Description beyond the standard pd sigma-model? / Drechsler SL,Malek J,Hayn R,Knupfer M,Moskvin AS,Fink J // INTERNATIONAL JOURNAL OF MODERN PHYSICS B. - 2003. - V. 17, l. 18-20, 1. - P. 3324-3328.

ISSN/EISSN:

0217-9792 / нет данных

Type:

Article; Proceedings Paper

Abstract:

Within a joint experimental and theoretical study the density-density response of the prototypical linear chain compound Sr2CuO3 has been investigated by means of polarization and momentum dependent electron energy loss spectroscopy (EELS) and exact diagonalizations including also the continued fraction technique for the determination of spectral densities such as the optical conductivity and the loss function, respectively. It has been shown that the lowest charge excitations of this ID charge transfer insulator cannot be described properly within the usual pdsigma-model for cuprates which is based on the Cu 3d(x)(-y)(2)(2) and the corresponding O 2psigma- states, only. The lowest energy charge excitations are dominated by O 2ppi final states within the CuO4 Plaquette plane. A detailed analysis of the EELS-data allows a classification into two types of charge transfer excitations with predominant pi and sigma character and various sizes of internal localization and dispersion.

Author keywords:

OPTICAL NONLINEARITY; SUPERCONDUCTORS; SR2CUO2CL2; INSULATORS; SYMMETRY; EXCITONS; CHAINS; PLANE

DOI:

10.1142/S0217979203021745

Web of Science ID:

ISI:000185634600019

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	AUG 10
Note	4th International Conference on New Theories, Discoveries and Applications of Superconductors and Related Materials, SAN DIEGO, CALIFORNIA, JAN 16-21, 2003
Publisher	WORLD SCIENTIFIC PUBL CO PTE LTD
Address	JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 912805, SINGAPORE
Language	English
Keywords-Plus	OPTICAL NONLINEARITY; SUPERCONDUCTORS; SR2CUO2CL2; INSULATORS; SYMMETRY; EXCITONS; CHAINS; PLANE
Research-Areas	Physics
Web-of-Science-Categories	Physics, Applied; Physics, Condensed Matter; Physics, Mathematical
ResearcherID-Numbers	Fink, Joerg/A-6003-2012 Malek, Jiri/G-7223-2014
Number-of-Cited-References	17
Journal-ISO	Int. J. Mod. Phys. B
Doc-Delivery-Number	727AV