A photoemission study of Bi3.6Pb0.4Sr3Ca2.4Er0.7Cu4O16 in normal and superconducting states

Cohen, Ori; Cummins, T.R.; Georgiadis, G.C.; Rastomjee, C.S.; Potter, F.H.; Egdell, R.G.; Flavell, Wendy R.; Law, Derek; Leonyuk, L.

doi:10.1016/0921-4534(94)90120-1

Cited by 1 publication

(1 citation statement)

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“…We note that TBHF + calculations reproduce the essentially localized nature of this feature, but show it to have strongly mixed Cu 3d and O 2p character [9]. Thus we conclude that while giving clear information about the screened nature of the final state, resonant photoemission within the main valence band of Cu II compounds may not be a particularly safe guide to the degree of Cu character of the initial state as the d 9 L 1 final state is not directly accessible via the resonating state, resulting, as we have seen, in very weak effects across the binding energy range 1-8 eV [25,26]. The appreciable Cu character in this part of the spectral profile indicates that CuO is somewhat different to a conventional charge-transfer insulator.…”

Section: Direct Comparison With CI Calculationsmentioning

confidence: 73%

Photoemission studies of single crystal CuO(100)

Warren

Flavell

Thomas

et al. 1999

J. Phys.: Condens. Matter

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Photoemission studies of a cleaved CuO single crystal have been carried out, using station 6.2 at the CLRC Daresbury Laboratory. The (100) face orientation produced by anvil cleaving was determined using Laue back-reflection and LEED. Resonant photoemission measurements at the Cu 3pCu 3d threshold were undertaken and these are compared with existing data from oxidized copper films, and with theoretical configuration interaction calculations for the resonance process. Angle-resolved measurements of the valence band structure have also been performed at different photon energies along three crystal axes, and these are mapped onto the 3D structure of the monoclinic material. This allows general comparison with existing momentum-resolved calculations. The validity of comparisons with both localized and delocalized descriptions of the electronic structure of this highly correlated oxide is discussed.

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Section: Direct Comparison With CI Calculationsmentioning

confidence: 73%