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Fermi surfaces and quasi-particle band dispersions of the iron pnictides superconductor KFe2As2 observed by angle-resolved photoemission spectroscopy |
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| Authors: | T. Yoshida I. Nishi M. Yi D.-H. Lu K. Kihou P.M. Shirage H. Kito C.H. Lee A. Iyo H. Eisaki H. Harima |
| Affiliation: | a Department of Physics, University of Tokyo, Tokyo 113-0033, Japan b JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda-ku, Tokyo 102-0075, Japan c Department of Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, CA 94305, USA d National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8562, Japan e Department of Physics, Kobe University, Kobe, Hyogo 657-8561, Japan |
| Abstract: | We have performed an angle-resolved photoemission study of the iron pnictide superconductor KFe2As2 with  . Most of the observed Fermi surfaces show almost two-dimensional shapes, while one of the quasi-particle bands near the Fermi level has a strong dispersion along the kz direction, consistent with the result of a band-structure calculation. However, hole Fermi surfaces α and ζ are smaller than those predicted by the calculation while other Fermi surfaces are larger. These observations are consistent with the result of a de Haas-van Alphen study and a theoretical prediction on inter-band scattering, possibly indicating many body effects on the electronic structure. |
| Keywords: | D. Electronic structure |
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