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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(Fe1−xyCoxMny)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. Bovensiepen41Leibniz-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(Fe1−xyCoxMny)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.

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