Volume 89, Number 2, January 2010
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||29 January 2010|
Droplet-like Fermi surfaces in the anti-ferromagnetic phase of EuFe2As2, an Fe-pnictide superconductor parent compound
Van der Waals-Zeeman Institute, University of Amsterdam - NL-1018XE Amsterdam, The Netherlands, EU
2 Helmholtz Zentrum Berlin - Albert-Einstein-Strasse 15, 12489 Berlin, Germany, EU
3 Leibniz Institute of Solid and Materials Research Dresden - P.O. Box 270116, D-01171, Dresden, Germany, EU
4 Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg-Universität 55099 Mainz, Germany, EU
5 I. Physikalisches Institut, Georg-August-Universität - Göttingen 37077, Germany, EU
6 Walther-Meissner-Institut - Walther-Meißner Strasse 8, 85748 Garching, Germany, EU
7 Paul Scherrer Institut, Swiss Light Source - 5232 Villigen, Switzerland
Corresponding author: firstname.lastname@example.org
Accepted: 11 January 2010
Using angle-resolved photoemission it is shown that the low-lying electronic states of the iron pnictide parent compound EuFe2As2 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.
PACS: 74.25.Jb – Electronic structure (photoemission, etc.) / 74.70.-b – Superconducting materials other than cuprates / 79.60.-i – Photoemission and photoelectron spectra
© EPLA, 2010
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