A complete set of polarized XAS spectra at copper L3-, oxygen K- and bismuth L3-edges have been recorded on the same well characterized single crystals of Bi2Sr2CaCu2O8+delta superconductor. The copper L3-edges show clearly the decrease of the 3d9 L line intensity when the electric field E of the incident X-ray beam rotates from the (a, b) plane to the c-axis direction. This result is in agreement with the x, y symmetry of the doping holes as shown by the oxygen K-edges without any ambiguity. The remaining intensity of the main 3d9 line on the copper L3-edge recorded with E parallel to c-axis let us assume that some holes could be created in the 3d3z2-r2 by overlapping with either the oxygen 2p(x,y) or the copper 4s orbitals. As observed before, the bismuth L3-edges show clearly the energy shift of the superconductor spectra towards low energy with respect to Bi(III) references confirming again the [Bi-O]infinity layers as electron reservoir. A maximum of this shift has been observed for E parallel to (a,b) in agreement with the presence of long Bi-O distances and o extra electrons in the bismuth layers.

XAS Study of Hole Density and Symmetry in a Bi2Sr2CaCu2O8+d Single Crystal / K. B., Garg; Saini, Naurang Lal; N., Merrien; F., Studer; S. DURCOK, G. TOURILLON. - In: SOLID STATE COMMUNICATIONS. - ISSN 0038-1098. - STAMPA. - 85(1993), pp. 447-453. [10.1016/0038-1098(93)90698-M]

XAS Study of Hole Density and Symmetry in a Bi2Sr2CaCu2O8+d Single Crystal

SAINI, Naurang Lal;
1993

Abstract

A complete set of polarized XAS spectra at copper L3-, oxygen K- and bismuth L3-edges have been recorded on the same well characterized single crystals of Bi2Sr2CaCu2O8+delta superconductor. The copper L3-edges show clearly the decrease of the 3d9 L line intensity when the electric field E of the incident X-ray beam rotates from the (a, b) plane to the c-axis direction. This result is in agreement with the x, y symmetry of the doping holes as shown by the oxygen K-edges without any ambiguity. The remaining intensity of the main 3d9 line on the copper L3-edge recorded with E parallel to c-axis let us assume that some holes could be created in the 3d3z2-r2 by overlapping with either the oxygen 2p(x,y) or the copper 4s orbitals. As observed before, the bismuth L3-edges show clearly the energy shift of the superconductor spectra towards low energy with respect to Bi(III) references confirming again the [Bi-O]infinity layers as electron reservoir. A maximum of this shift has been observed for E parallel to (a,b) in agreement with the presence of long Bi-O distances and o extra electrons in the bismuth layers.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11573/130517
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