Physics – Condensed Matter – Superconductivity
Scientific paper
2009-12-17
EPL 89, 27007 (2010).
Physics
Condensed Matter
Superconductivity
4 figures, 6 pages
Scientific paper
Using angle resolved photoemission it is shown that the low lying electronic states of the iron pnictide parent compound EuFe$_2$As$_2$ are strongly modified in the magnetically ordered, low temperature, orthorhombic state compared to the tetragonal, paramagnetic case above the spin density wave transition temperature. Back-folded bands, reflected in the orthorhombic/ anti-ferromagnetic Brillouin zone boundary hybridize strongly with the non-folded states, leading to the opening of energy gaps. As a direct consequence, the large Fermi surfaces of the tetragonal phase fragment, the low temperature Fermi surface being comprised of small droplets, built up of electron and hole-like sections. These high resolution ARPES data are therefore in keeping with quantum oscillation and optical data from other undoped pnictide parent compounds.
Duerr H. A.
Erb Andreas
Fink Joerg
Follath R.
Gegenwart Philip
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