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O KVV Auger emission versus resonant photoemission at the O K edge of high-Tc superconductors
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- Nylén, H. (author)
- Lund University,Lunds universitet,Synkrotronljusfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Synchrotron Radiation Research,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
- Qvarford, M. (author)
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- Chiaia, G. (author)
- Polytechnic University of Milan
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- (creator_code:org_t)
- 1998
- 1998
- English 10 s.
- In: Physica C: Superconductivity and its Applications. - 0921-4534. ; 300:3-4, s. 161-170
- Journal article (peer-reviewed)
Abstract
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- Photoelectron spectroscopy results on single crystals of the superconductors Bi2Sr2CaCu2O8,Bi2Sr 2CuO6, Ba0.6K0.4BiO3 and the semiconductor Ba0.9K0.1BiO3 are reported for the photon energy region around the O K absorption threshold. The development of the O-KVV Auger structure has been carefully monitored as a function of photon energy. A non-monotonic behavior displaying a feature at a constant binding energy of about 14 eV was found for Bi2Sr2CaCu2O8 and Bi2Sr2CuO6 in a narrow photon energy region of 1 eV at the main edge of the O K absorption spectrum around 530 eV. The corresponding enhancement, connected with the autoionization of O 2 p states, is absent in Ba1-xKxBiO3 in contrast to Bi2Sr2CaCu2O8 and Bi2Sr2CuO6. The resonant enhancement is more pronounced for Bi2Sr2CuO6 as compared to Bi2Sr2CaCu2O8, which can be explained by a lower charge carrier concentration in the former case, leading to a more localized nature of intermediate O 2 p states. The model parameters Cu d-d and O p-p Coulomb interactions and the charge transfer energy Δ are estimated from the experiments.
Keyword
- Coulomb interactions
- Cu-O planes
- Electronic structure
- Resonant photoemission
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- Nylén, H.
- Qvarford, M.
- Chiaia, G.
- Tjernberg, O.
- Söderholm, S.
- Zakharov, A. A.
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- Leandersson, M.
- Nazin, V. G.
- Tsetlin, M. B.
- Lev, L.
- Andersen, J. N.
- Nyholm, R.
- Lindau, I.
- Karlsson, U. O.
- Mikheeva, M. N.
- Leonyuk, L.
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