Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 6: Invited Talks Suga / Münzenberg

MA 6.1: Hauptvortrag

Montag, 25. Februar 2008, 14:00–14:30, EB 301

Genuine bulk electronic structures of strongly correlated transition metal oxides revealed by high energy photoelectron spectroscopy — •Shigemasa Suga — Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, Japan

It was gradually revealed that conventional photoelectron spectroscopy (PES) in the 20-130 eV energy range mainly probes the surface electronic structures - noticeably different from bulk electronic structures - in strongly correlated electron systems such as ruthenates, high Tc cuprates, manganites as well as vanadates.

Soft X-ray angle-resolved PES in several hundred eV energy region is very powerful to probe three dimensional (3D) bulk band dispersions and 3D Fermi surface topology by properly tuning the photon energy. The Fermiology in such phases and such crystals, which are not accessible by dHvA measurements, can be performed by this methodology.

Further bulk sensitive PES is now available in the hard X-ray region in several keV with modest resolution down to 50 meV. This technique (HAXPES)is not only available for core level spectroscopy but also for valence band spectroscopy in spite that the photoionization cross sections are generally several orders of magnitude lower than in the conventional PES. Genuine bulk electronic structures as well as surface and subsurface electronic structures can be studied by changing the photon energy from few keV up to 10 keV. Long standing controversies are now gradually solved by the state of the art photoelectron spectroscopy.