Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 36: SC: Fe-based Superconductors - 122 - Properties, Electronic Structure, Mechanisms

TT 36.12: Talk

Wednesday, March 16, 2011, 17:00–17:15, HSZ 304

Electronic structure of TM doped Ba122 Iron Arsenide superconductors — •Anna Buling¹, Ernst Kurmaev², John McLeod³, Nikolai A. Skorikov², Manfred Neumann¹, Alexander Moewes³, Yuri A. Izyumov², Larisa D. Finkelstein², Ni Ni⁴, Sergey L. Bud’ko⁴, and Paul C. Canfield⁴ — ¹Department of Physics, University of Osnabrück, Barbarastr. 7, D-49069 Osnabrück, Germany — ²Institute of Metal Physics, Russian Academy of Sciences-Ural Division, 620219 Yekaterinburg, Russia — ³Department of Physics and Engineering Physics, University of Saskatchewan, 116 Science Place, Saskatoon, Saskatchewan S7N 5E2, Canada — ⁴Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

We report on a detailed investigation of the electronic structure of undoped and 3d−metal doped Ba122 superconductors by means of x-ray spectroscopy.

Suprisingly it is found that in spite of the localized magnetic moments a substitution of Fe sites in BaFe₂As₂ with Ni and Co results in superconductivity. The characteristic changes in the electronic structure of Ba122 induced by doping are determined by XPS and RIXS measurements. DFT calculations are added to underline the influence of the doping.

The main goal of this work is to illuminate the superconductivity mechanism in this compound.