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

Brouet, V.; Lin, Ping-Hui; Texier, Y.; Bobroff, J.; Taleb-Ibrahimi, A.; Fèvre, P. Le; Bertran, F.; Casula, M.; Werner, Philipp; Biermann, S.; Rullier-Albenque, F.; Forget, A.; Colson, D.

doi:10.1103/PhysRevLett.110.167002

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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

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₋Co_x)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

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Identifiers

RERO DOC 32532
DOI 10.1103/PhysRevLett.110.167002

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https://folia.unifr.ch/unifr/documents/303148

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