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    2 results 1
    Université de Fribourg

    Optical signature of a crossover from Mott- to Slater-type gap in ${\mathrm{Sr}}_{2}{\mathrm{Ir}}_{1\ensuremath{-}x}{\mathrm{Rh}}_{x}{\mathrm{O}}_{4}$

    Xu, Bîng ; Marsik, Premysl ; Sheveleva, Evgeniia ; Lyzwa, Fryderyk ; Louat, A. ; Brouet, V. ; Munzar, Dominik ; Bernhard, Christian

    In: Physical Review Letters, 2020, vol. 124, no. 2, p. 027402

    With optical spectroscopy we provide evidence that the insulator-metal transition in Sr2Ir1−xRhxO4 occurs close to a crossover from the Mott- to the Slater-type. The Mott gap at x=0 persists to high temperature and evolves without an anomaly across the Néel temperature, TN. Upon Rh doping, it collapses rather rapidly and vanishes around x=0.055. Notably, just as the Mott gap vanishes yet...

    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...

    2 results 1
    See also: similar author names
    2 Brouet, V.