Taking advantage of the linear polarisation of synchrotron radiation' the polarisation dependence of the 0 K and Cu L3 X-ray absorption edges has been compared for in situ cleaved Bi2Sr2CaCu2O8 and Bi2Sr2CuO6 single crystals. The X-ray absorption spectra were measured by means of total electron yield detection. The spectra show for both crystals that the lowest unoccupied Cu 3d and 0 2p orbitals are dominantly oriented parallel to the a-b plane, but also the presence of a small amount of unoccupied orbitals oriented perpendicular to the a-b plane can be deduced from both the 0 K and Cu L3 absorption spectra. A shift of the order of 0.5 eV between absorption into the in-plane and the out-of-plane Cu 3d orbitals was measured for the Bi2Sr2CaCu2O8 crystal, but no such shift was found for the Bi2Sr2CuO6 crystal.

Polarisation dependent X-ray Absorption in High-and Low-Tc Bi2Sr2Can-1CunO4+2n Superconductors / M., Qvarford; Saini, Naurang Lal; J. N., Andersen; R., Nyholm; E., Lundgren; I., Lindau; J. F., VAN ACKER; L., Leonyuk; S. SODERHOLM, S. A. FLODSTROM. - In: PHYSICA. C, SUPERCONDUCTIVITY. - ISSN 0921-4534. - STAMPA. - 214:(1993), pp. 119-126. [10.1016/0921-4534(93)90116-8]

Polarisation dependent X-ray Absorption in High-and Low-Tc Bi2Sr2Can-1CunO4+2n Superconductors

SAINI, Naurang Lal;
1993

Abstract

Taking advantage of the linear polarisation of synchrotron radiation' the polarisation dependence of the 0 K and Cu L3 X-ray absorption edges has been compared for in situ cleaved Bi2Sr2CaCu2O8 and Bi2Sr2CuO6 single crystals. The X-ray absorption spectra were measured by means of total electron yield detection. The spectra show for both crystals that the lowest unoccupied Cu 3d and 0 2p orbitals are dominantly oriented parallel to the a-b plane, but also the presence of a small amount of unoccupied orbitals oriented perpendicular to the a-b plane can be deduced from both the 0 K and Cu L3 absorption spectra. A shift of the order of 0.5 eV between absorption into the in-plane and the out-of-plane Cu 3d orbitals was measured for the Bi2Sr2CaCu2O8 crystal, but no such shift was found for the Bi2Sr2CuO6 crystal.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/133773
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