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TT: Fachverband Tiefe Temperaturen

TT 53: Superconductivity: Fe-based Superconductors - 122

TT 53.11: Vortrag

Mittwoch, 2. April 2014, 12:15–12:30, HSZ 201

Raman study of SDW order and band-folding in twin-free BaFe₂As₂ — •Florian Kretzschmar¹, Thomas Böhm¹, Bernhard Muschler¹, Andreas Baum¹, Rudi Hackl¹, Alexander F. Kemper^2,3, Thomas P. Devereaux^3,4, James G. Analytis⁵, Jiun-Haw Chu^5,6, and Ian R. Fisher^3,4 — ¹Walther Meissner Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — ²Computational Research Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA — ³Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA — ⁴Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA — ⁵Department of Physics, University of California, Berkeley, California 94720, USA — ⁶Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

We present results of electronic Raman scattering experiments on detwinned BaFe₂As₂ above and below the transition into the spin-density-wave (SDW) state. We observe signatures of the SDW gap in all symmetries. The spectra indicate a strong mixing of the bands due to backfolding along the SDW vector. For analysis we calculated the Raman susceptibility on the basis of a 5 band tight binding model using the effective mass approximation. Prominent features in the Raman response can be traced back to a few interband transitions.