Speaker
Dr
Masaki Kobayashi
(Paul Sherrer Institut)
Description
Iron-based superconductors have attracted much attention because of the unexpected high transition temperatures. The mechanism of superconducting state in iron pnictides is considered to be different from high-Tccuprates. In contrast to two-dimensionality of Co-O plane in cuprates, hole-doped Ba1-xKxFe2As2(BKFA) has been reported to show the superconducting gap depending on kz momentum.Investigation of bulk three-dimensional electronic structure will provide therefore further understanding of physical properties of BKFA.
Soft X-ray angle-resolved photoemission spectroscopy (SX-ARPES) is one of the most promising methods to measure bulk band structure of materials due to the increase of probing depth and high kz-momentum resolution. In this study, we have investigated the shape and kz-dependence of the Fermi surfaces(FSs) in BKFA. The experimental FSs show alternatingin-plane shapes and modulation along kz direction corresponding to periodicity of the Brillouin zones. These effects show clear polarization dependence reflecting orbital character of the bands forming the FS. These results provide with experimental information on the dimensionality and orbital character of FSs.
Please specify poster or talk
Poster
Please specify the session
Strongly correlated electron system, high-Tc superconductor, angle-resolved photoemission
Primary author
Dr
Masaki Kobayashi
(Paul Sherrer Institut)
Co-authors
Mr
Elia Razzoli
(Paul Sherrer Institut)
Prof.
Hong Ding
(Institute of Physics, Chinese Academy of Sciences)
Dr
Luc Patthey
(Paul Sherrer Institut)
Prof.
Masaharu Oshima
(University of Tokyo)
Dr
Ming Shi
(Paul Sherrer Institut)
Dr
Thorsten Schmitt
(Paul Sherrer Institut)
Dr
Vladimir Strocov
(Paul Sherrer Institut)
Mr
Yaobo Huang
(Institute of Physics, Chinese Academy of Sciences)
