Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 34: SC: Iron-Based Superconductors - 122

TT 34.8: Talk

Thursday, March 25, 2010, 16:00–16:15, H20

Self-energy effects, el-ph coupling and non FL behavior in Fe-As superconductors — •Peter Lemmens¹, Kwang-Yong Choi¹, Dirk Wulferding¹, Vladimir Gnezdilov², Ilya Eremin³, Helmuth Berger⁴, Chengtian Lin⁵, Shigeru Kasahara⁶, and Yuji Matsuda⁶ — ¹IPKM, TU-BS, Braunschweig — ²ILTP, Kharkov, Ukraine — ³ITP, Univ. Bochum — ⁴EPFL, Lausanne — ⁵MPI-FKF Stuttgart — ⁶GSS, Univ. Kyoto, Japan

Raman scattering experiments of the undoped Sr-122 and the doped, superconducting pnictides show anomalies of a B_1g phonon induced by SC and SDW transitions. We give estimates of the electron-phonon coupling related to this renormalization. We follow the cross over from Fermi to non-Fermi liquid behavior with P-doping. In addition, we observe a pronounced quasi-elastic Raman response and a weak renormalization of an electronic continuum. Work supported by DFG.