Non-Fermi-liquid scattering rates and anomalous band dispersion in ferropnictides

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Contributors

  • J. Fink - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • A. Charnukha - , Leibniz Institute for Solid State and Materials Research Dresden, University of California at San Diego (Author)
  • E. D.L. Rienks - , Helmholtz Centre Berlin for Materials and Energy (Author)
  • Z. H. Liu - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • S. Thirupathaiah - , Helmholtz Centre Berlin for Materials and Energy, Indian Institute of Science Bangalore (Author)
  • I. Avigo - , University of Duisburg-Essen (Author)
  • F. Roth - , German Electron Synchrotron (DESY) (Author)
  • H. S. Jeevan - , Augsburg University, PESITM (Author)
  • P. Gegenwart - , Augsburg University (Author)
  • M. Roslova - , Leibniz Institute for Solid State and Materials Research Dresden, Lomonosov Moscow State University (Author)
  • I. Morozov - , Leibniz Institute for Solid State and Materials Research Dresden, Lomonosov Moscow State University (Author)
  • S. Wurmehl - , Leibniz Institute for Solid State and Materials Research Dresden, TUD Dresden University of Technology (Author)
  • U. Bovensiepen - , University of Duisburg-Essen (Author)
  • S. Borisenko - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • M. Vojta - , Chair of Theoretical Solid State Physics (Author)
  • B. Büchner - , Chair of Experimental Solid State Physics, Leibniz Institute for Solid State and Materials Research Dresden (Author)

Abstract

Angle-resolved photoemission spectroscopy is used to study the band dispersion and the quasiparticle scattering rates in two ferropnictide systems. We find the scattering rate for any given band to depend linearly on energy but to be independent of the control parameter. We demonstrate that the linear energy dependence gives rise to a weakly dispersing band with a strong mass enhancement when the band maximum crosses the chemical potential. The resulting small effective Fermi energy favors a BCS [J. Bardeen, Phys. Rev. 108, 1175 (1957)PHRVAO0031-899X10.1103/PhysRev.108.1175] -Bose-Einstein [S. N. Bose, Z. Phys. 26, 178 (1924)EPJAFV1434-600110.1007/BF01327326] crossover state in the superconducting phase.

Details

Original languageEnglish
Article number201106
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number20
Publication statusPublished - 12 Nov 2015
Peer-reviewedYes

Keywords

ASJC Scopus subject areas