A flat band at the chemical potential of a Fe1.03Te0.94S0.06 superconductor observed by angle-resolved photoemission spectroscopy (Articolo in rivista)

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  • A flat band at the chemical potential of a Fe1.03Te0.94S0.06 superconductor observed by angle-resolved photoemission spectroscopy (Articolo in rivista) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/0953-8984/25/19/195701 (literal)
Alternative label
  • P Starowicz1, H Schwab2,3, J Goraus4, P Zajdel4, F Forster2,3, J R Rak1, M A Green5,6,7, I Vobornik8 and F Reinert2,3 (2013)
    A flat band at the chemical potential of a Fe1.03Te0.94S0.06 superconductor observed by angle-resolved photoemission spectroscopy
    in Journal of physics. Condensed matter (Online)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • P Starowicz1, H Schwab2,3, J Goraus4, P Zajdel4, F Forster2,3, J R Rak1, M A Green5,6,7, I Vobornik8 and F Reinert2,3 (literal)
Pagina inizio
  • 195701 (literal)
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  • http://iopscience.iop.org/0953-8984/25/19/195701/article (literal)
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  • 25 (literal)
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  • Scopu (literal)
  • ISI Web of Science (WOS) (literal)
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  • 1 M Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland 2 Universität Würzburg, Experimentelle Physik VII, Am Hubland, D-97074 Würzburg, Germany 3 Karlsruher Institut für Technologie KIT, Gemeinschaftslabor für Nanoanalytik, D-76021 Karlsruhe, Germany 4 Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland 5 NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA 6 Materials Science and Engineering, University of Maryland, College Park, MD-20742-6033, USA 7 School of Physical Sciences, University of Kent, Canterbury, Kent, CT2 7NH, UK 8 CNR-IOM, TASC Laboratory, SS 14, km 163.5, I-34149 Trieste, Italy (literal)
Titolo
  • A flat band at the chemical potential of a Fe1.03Te0.94S0.06 superconductor observed by angle-resolved photoemission spectroscopy (literal)
Abstract
  • The electronic structure of superconducting Fe1.03Te0.94S0.06 has been studied by angle-resolved photoemission spectroscopy (ARPES). Experimental band topography is compared to the calculations using the methods of Korringa-Kohn-Rostoker (KKR) with the coherent potential approximation (CPA) and the linearized augmented plane wave with local orbitals (LAPW+LO) method. The region of the ? point exhibits two hole pockets and a quasiparticle peak close to the chemical potential (?) with undetectable dispersion. This flat band with mainly dz2 orbital character is most likely formed by the top of the outer hole pocket or is evidence of a third hole band. It may cover up to 3% of the Brillouin zone volume and should give rise to a Van Hove singularity. Studies performed for various photon energies indicate that at least one of the hole pockets has a two-dimensional character. The apparently nondispersing peak at ? is clearly visible for 40 eV and higher photon energies, due to an effect of the photoionization cross-section rather than band dimensionality. Orbital characters calculated by LAPW+LO for stoichiometric FeTe do not reveal the flat dz2 band but are in agreement with the experiment for the other dispersions around ? in Fe1.03Te0.94S0.06. (literal)
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