Journal article

Large temperature dependence of the number of carriers in co-doped BaFe₂As₂

  • Brouet, V. Laboratoire de Physique des Solides, Université Paris-Sud, France
  • Lin, Ping-Hui Laboratoire de Physique des Solides, Université Paris-Sud, France
  • Texier, Y. Laboratoire de Physique des Solides, Université Paris-Sud, France
  • Bobroff, J. Laboratoire de Physique des Solides, Université Paris-Sud, France
  • Taleb-Ibrahimi, A. Synchrotron SOLEIL, Gif sur Yvette, France
  • Fèvre, P. Le Synchrotron SOLEIL, Gif sur Yvette, France
  • Bertran, F. Synchrotron SOLEIL, Gif sur Yvette, France
  • Casula, M. Institut de Minéralogie et de Physique des Milieux condensés, Université Pierre et Marie Curie, Paris, France
  • Werner, Philipp Department of Physics, University of Fribourg, Switzerland
  • Biermann, S. Centre de Physique Théorique, Ecole Polytechnique, Palaiseau, France
  • Rullier-Albenque, F. Service de Physique de l’Etat Condensé, Gif sur Yvette Cedex, France
  • Forget, A. Service de Physique de l’Etat Condensé, Gif sur Yvette Cedex, France
  • Colson, D. Service de Physique de l’Etat Condensé, Gif sur Yvette Cedex, France
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    16.04.2013
Published in:
  • Physical Review Letters. - 2013, vol. 110, no. 16, p. 167002
English Using angle-resolved photoemission spectroscopy, we study the evolution of the number of carriers in Ba(Fe₁₋Cox)₂As₂ as a function of Co content and temperature. We show that there is a k-dependent energy shift compared to density functional calculations, which is large below 100 K at low Co contents and reduces the volume of hole and electron pockets by a factor 2. This k shift becomes negligible at high Co content and could be due to interband charge or spin fluctuations. We further reveal that the bands shift with temperature, changing significantly the number of carriers they contain (up to 50%). We explain this evolution by thermal excitations of carriers among the narrow bands, possibly combined with a temperature evolution of the k-dependent fluctuations.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/303148
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