Münster 1997 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 6: Postersitzung I: Mesoskopie(1-21), amorphe Metalle und Defektsysteme(22-29), Kryotechnik, Kernmagnetismus(30-37), festes N2(38), Quantenflüssigkeiten und -kristalle(39-48), dünne supraleitende Filme(49-68), schwere Fermionen und Kondosysteme(69-92), Fullerene(93-94)
TT 6.101: Poster
Dienstag, 18. März 1997, 09:30–13:00, Z1
Electronic Structure of SrNbO3.45 Single Crystals Measured by Various Photoemission Techniques — •C.S. Gopinath1, D.H. Lu1, M. Schmidt1, T.R. Cummins1, N. N"ucker1, S. Schuppler1, and F. Lichtenberg2 — 1Forschungszentrum Karlsruhe, Institut f. Nukleare Festkörperphysik, Postfach 3640, D-76021 Karlsruhe — 2Varta Batterie AG, R and D Center, D-65779 Kelkheim
The electronic structure of the semiconducting and layered-perovskite related compound SrNbO3.45 has been investigated by ultraviolet photoemission spectroscopy, both angle-integrated (UPS) and angle resolved (ARUPS). From constant initial state spectroscopy, the low intensity feature observed in UPS at 0.6 eV below the Fermi level, EF, is attributed to Nb 4d states. UPS measurements indicate that the main valence band consists essentially of oxygen 2p states. ARUPS studies show two bands near the EF with very different dispersions: Along Γ-X, one band exhibits no discernible dispersion, whereas the other disperses strongly and even crosses EF. No dispersion appears along the Γ-Y direction. The induction of metallic and possible superconducting behaviour in this layered niobate system is also discussed.