Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 2: Superconductivity: Fe-based Superconductors - 1111, LiFeAs & As-free Pnictides
TT 2.7: Vortrag
Montag, 26. März 2012, 11:00–11:15, H 2053
Anisotropic Energy-Gaps of Iron-Based Superconductivity from Intra-Band Quasiparticle Interference in LiFeAs — •A.W. Rost1,2, M.P. Allan1,2,3, A.P. Mackenzie2, Y. Xie3, J.C. Davis1,2,3,4, K. Kihou5, C.-H. Lee5, A. Iyo5, H. Eisaki5, and T.-M. Chuang1,3,6 — 1LASSP, Department of Physics, Cornell, Ithaca, NY 14853, USA — 2SUPA, School of Physics and Astronomy, Univ. of St Andrews, St Andrews, Fife KY16 9SS, UK — 3CMPMS Department, Brookhaven National Laboratory, Upton, NY 11973, USA — 4Kavli Institute at Cornell for Nanoscale Science, Cornell, Ithaca , NY 14853, USA — 5AIST, Tsukuba, Ibaraki 305-8568, Japan — 6Inst. of Physics, Academica Sinica, Nankang, Taipei 11529, Taiwan
Cooper pairing in the Fe-based superconductors is thought to occur due to the projection of the antiferromagnetic interactions between iron atoms onto the complex momentum-space electronic structure. A key consequence is that distinct anisotropic energy gaps Δi(k) with specific relative orientations should occur on the different electronic bands i. To determine this previously unresolved gap structure high-precision spectroscopy is required. Here we introduce the STM technique of intra-band Bogoliubov quasiparticle scattering interference (QPI) to iron-based superconductor studies, focusing on LiFeAs. We identify the QPI signatures of three hole-like dispersions and, by introducing a new QPI technique, determine the magnitude and relative orientations of corresponding anisotropic Δi(k). Intra-band Bogoliubov QPI therefore yields the spectroscopic information required to identify the mechanism of superconductivity in Fe-based superconductors.