Physics – Condensed Matter – Superconductivity
Scientific paper
2009-12-15
PhysRevLett.105.027001 (2009)
Physics
Condensed Matter
Superconductivity
5 pages, 4 figures, accepted by PRL
Scientific paper
We report the first comprehensive high-resolution angle-resolved photoemission measurements on CeFeAsO, a parent compound of FeAs-based high temperature superconductors with a mangetic/structural transition at $\sim$150 K. In the magnetic ordering state, four hole-like Fermi surface sheets are observed near $\Gamma$(0,0) and the Fermi surface near M(+/-$\pi$,+/-$\pi$) shows a tiny electron-like pocket at M surrounded by four Dirac cone-like strong spots. The unusual Fermi surface topology deviates strongly from the band structure calculations. The electronic signature of the magnetic/structural transition shows up in the dramatic change of the quasiparticle scattering rate. A dispersion kink at $\sim$ 25meV is for the first time observed in the parent compound of Fe-based superconductors.
Chen Chuangtian
Chen Guo-Feng
Chen Zhaoyu
Dong Xiaoli
He Junfeng
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