Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 8: Superconductivity: Fe-based Superconductors - 122 Part 1
TT 8.13: Vortrag
Montag, 26. März 2012, 18:15–18:30, H 2053
Dispersive High-Energy Spin Excitations in Iron Pnictide Superconductors Investigated with RIXS — •Thorsten Schmitt1, Kejin Zhou1, Y. B. Huang1,2, C. Monney1, V. N. Strocov1, J. van den Brink3, and H. Ding2 — 1Paul Scherrer Institut, Villigen PSI, Switzerland — 2IOP, CAS, Beijing, China — 3IFW Dresden, Germany
The discovery of iron-based high temperature superconductivity has triggered tremendous research efforts in searching for novel high-Tc superconductors. Unlike cuprates, which have long-range ordered antiferromagnetic Mott insulators as parent compounds, the parent compounds of iron-based superconductors are spin-density wave metals with delocalized electronic structure and more itinerant magnetism.
Recent developments of the high-resolution resonant inelastic X-ray scattering (RIXS) technique [1] have enabled investigations of magnetic excitations in cuprates [2], which show excellent agreement with results from Inelastic Neutron Scattering. In this presentation we demonstrate that RIXS can be used to measure collective magnetic excitations in iron-based superconductors despite their much stronger itinerancy compared to cuprates. The persistence of high-energy spin excitations even in optimally doped pnictide superconductors in a wide range of temperatures strongly suggests a spin-mediated Cooper pairing mechanism as proposed in cuprate superconductors.
G. Ghiringhelli et al., Rev. Sci. Inst. 77, 113108 (2006); V. N. Strocov et al., J. Synch. Rad. 17, 631 (2010).
J. Schlappa et al., Phys. Rev. Lett. 103, 047401 (2009); L. Braicovich et al., Phys. Rev. Lett. 104, 077002 (2010).