Université de Fribourg

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.

In: Physical Review Letters, 2013, vol. 110, no. 16, p. 167002

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...