Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 53: Superconductivity: Fe-based Superconductors - 122

TT 53.7: Talk

Wednesday, April 2, 2014, 11:00–11:15, HSZ 201

Electronic structure and quantum criticality in Ba(Fe_1−x−yCo_xMn_y)₂As₂, an ARPES study. — •J. Fink¹, E.D.L. Rienks², T. Wolf³, K. Koepernik¹, I. Avigo⁴, P. Hlawenka², C. Lupulescu⁵, T. Arion⁶, F. Roth⁷, W. Eberhardt⁷, and U. Bovensiepen⁴ — ¹Leibniz-Institute for Solid State and Materials Research, Dresden, Germany — ²Helmholtz-Zentrum, Berlin, Germany — ³Karlsruhe Institute of Technology, Karlsruhe, Germany — ⁴Universität Duisburg-Essen, Duisburg, Germany — ⁵Technische Universität Berlin, Berlin, Germany — ⁶Universität Hamburg, Hamburg, Germany — ⁷Center for Free-Electron Laser Science, Hamburg, Germany

We used angle-resolved photoemission spectroscopy (ARPES) and density functional theory calculations to study the electronic structure of Ba(Fe_1−x−yCo_xMn_y)₂As₂ for x=0.06 and 0≤ y ≤ 0.07. From ARPES we derive that the substitution of Fe by Mn does not lead to hole doping, indicating a localization of the induced holes. An evaluation of the measured spectral function does not indicate a diverging effective mass or scattering rate near optimal doping. Thus the present ARPES results indicate a continuous evolution of the quasiparticle interaction and therefore question previous quantum critical scenarios.