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Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 33: Superconductivity, Measuring Devices, Matter at Low Temperature: Poster Session

TT 33.7: Poster

Wednesday, March 28, 2012, 15:00–19:00, Poster B

Three-dimiensional Fermi surface of Iron-pnictide superconductor Ba1−xKxFe2As2 — •Masaki Kobayashi1,2, Vladimir N. Strocov1, Elia Razzoli1,3, Ming Shi1, Thorsten Schmitt1, Xiaoping Wang1,4, Yaobo Huang4, Hong Ding4, Masaharu Oshima2, and Luc Patthey11Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland — 2Department of Applied Chemistry, University of Tokyo, Tokyo, Japan — 3Laboratory for Synchrotron and Neutron Spectroscopy, EPFL, Lausanne, Switzerland — 4Institute of Physics, Chinese Academy of Science, Beijing, China

Iron-based superconductors have attracted much attention because of the unexpected high transition temperatures of the superconducting state. Investigation of bulk three-dimensional electronic structure will provide further understanding of the superconducting properties of Ba1−xKxFe2As2 (BKFA). Here, we report investigations of the shape and kz-dependence of the Fermi surface (FS) in BKFA with soft X-ray ARPES, taking into advantage enhanced bulk sensitivity and intrinsic kz resolution achieved in the soft-X-ray range.

The experimental FS measured at energies around 900 eV show modulations along the kz direction corresponding to the Brillouin zone periodicity in BKFA. The in-plane FS shapes alternate between a circle-like and flower-like appearances when going from the Γ point to the higher Brillouin zones. Furthermore, we observed clear polarization dependences of the FS, allowing separation of different valence bands. The results provide with experimental information on the dimensionality and orbital character of FSs of BKFA.

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