Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 5: Postersession Superconductivity: Materials - Fabrication and Properties
TT 5.35: Poster
Montag, 23. März 2009, 13:00–16:45, P1A
Electronic structure studies of BaFe2As2 by angle-resolved photoemission spectroscopy — •Thirupathaiah Setti1, Jörg Fink1,2, Ruslan Ovsyannikov1, Hermann Andreas Dürr1, Cludia Felser3, Shafagh Dastjani Farahani3, Dirt Johrendt4, Marianne Rotter4, Yingkai Huang5, Sanne de Jong5, and Mark Golden5 — 1Helmholtz Zentrum, Berlin — 2IFW, Dresden — 3Inst.für Anorg. Chemie und Anal. Chemie, Johannes Gutenberg-Universität, Mainz — 4Department Chemie und Biochemie, LMU München, München — 5Vander Waals-Zeeman Institute, University of Amsterdam, Amsterdam, The Netherlands
We report high resolution angle-resolved photoemission spectroscopy (ARPES) studies of the electronic structure of BaFe2As2, which is one of the parent compounds of the Fe-pnictide superconductors. ARPES measurements have been performed at 20 K and 300 K, corresponding to the orthorhombic antiferromagnetic phase and the tetragonal paramagnetic phase, respectively. Photon energies between 30 and 175 eV and polarizations parallel and perpendicular to the scattering plane have been used.Changes in spectral weights at the Fermi level upon variation of the polarization of the incident photons yield important information on the orbital character of the states near the Fermi level. Only small differences in the electronic structure are observed between 20 and 300 K. The results are compared with LAPW calculations for the tetragonal paramagnetic phase and the orthorhombic antiferromagnetic state. Finally, the photon energy dependence of the spectra provides information on the kz dispersion of the bands.