A flat band at the chemical potential of a Fe1.03Te 0.94S0.06 superconductor observed by angle-resolved photoemission spectroscopy

Starowicz, P. and Schwab, H. and Goraus, J. and Zajdel, P. and Forster, F. and Rak, J.R. and Green, M.A. and Vobornik, I. and Reinert, F. (2013) A flat band at the chemical potential of a Fe1.03Te 0.94S0.06 superconductor observed by angle-resolved photoemission spectroscopy. Journal of Physics Condensed Matter, 25 (19). 0-0. ISSN 09538984 (ISSN). (doi:https://doi.org/10.1088/0953-8984/25/19/195701) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Abstract

The electronic structure of superconducting Fe1.03Te 0.94S0.06 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 Î? point exhibits two hole pockets and a quasiparticle peak close to the chemical potential (μ) 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 μ 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 Î? in Fe1.03Te0.94S 0.06. © 2013 IOP Publishing Ltd.

Item Type: Article
Additional information: Unmapped bibliographic data: C7 - 195701 [EPrints field already has value set] LA - English [Field not mapped to EPrints] J2 - J Phys Condens Matter [Field not mapped to EPrints] C2 - 23604265 [Field not mapped to EPrints] AD - M Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland [Field not mapped to EPrints] AD - Universität Würzburg, Experimentelle Physik VII, Am Hubland, D-97074 Würzburg, Germany [Field not mapped to EPrints] AD - Karlsruher Institut für Technologie KIT, Gemeinschaftslabor für Nanoanalytik, D-76021 Karlsruhe, Germany [Field not mapped to EPrints] AD - Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland [Field not mapped to EPrints] AD - NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, United States [Field not mapped to EPrints] AD - Materials Science and Engineering, University of Maryland, College Park, MD-20742-6033, United States [Field not mapped to EPrints] AD - School of Physical Sciences, University of Kent, Canterbury, Kent CT2 7NH, United Kingdom [Field not mapped to EPrints] AD - CNR-IOM, TASC Laboratory, SS 14, km 163.5, I-34149 Trieste, Italy [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: Angle resolved photoemission spectroscopy, Coherent-potential approximation, Korringa-kohn-rostoker, Linearized augmented plane waves, Orbital character, Photoionization cross-section, Quasi particles, Van Hove singularities, Dispersions, Electronic structure, Photoelectron spectroscopy, Photoionization, Photons, Superconductivity, Chemical potential, iron, selenium, tellurium, article, chemical model, chemical structure, chemistry, computer simulation, electric conductivity, electron transport, materials testing, methodology, X ray photoelectron spectroscopy, Computer Simulation, Electric Conductivity, Electron Transport, Iron, Materials Testing, Models, Chemical, Models, Molecular, Photoelectron Spectroscopy, Selenium, Tellurium
Subjects: Q Science > QC Physics > QC173.45 Condensed Matter
Q Science > QD Chemistry > QD478 Solid State Chemistry
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Giles Tarver
Date Deposited: 14 Oct 2015 11:19 UTC
Last Modified: 14 Oct 2015 11:19 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/50960 (The current URI for this page, for reference purposes)
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