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TT: Fachverband Tiefe Temperaturen

TT 34: Superconductivity - Vortex Dynamics, Vortex Phases, Pinning

TT 34.2: Talk

Friday, March 30, 2007, 10:30–10:45, H19

Vortex Structures in Tantalum, Vandium and Niobium — •Sebastian Mühlbauer¹, Peter Böni¹, Christian Pfleiderer¹, Robert Georgii², Edward Forgan³, Charlotte Bowell³, and Mark Laver³ — ¹Physikdepartment E21, TU München, Garching — ²Foschunsgneutronenquelle Heinz Maier-Leibnitz, Garching — ³School of Physics and Astronomy, Birmingham (UK)

Small angle neutron scattering directly maps the fourier transform of the vortex lattice (VL) of type II superconductors and gives valuable informations on both the underlying fermi surface and the mechanism of the superconducting pairing. But the symmetry of the VL is also mainly influenced by pinning and impurity effects. Recent studies of the VL in the classical superconductors Tantalum, Vanadium and Niobium with field applied along the four-fold (100) axis will be presented. Four fold VL patterns, breaking the crystal symmetry have been identified in Niobium, which can be explained by non-local corrections in the Eilenberger model. Furthermore, recent polarised neutron studies of the VL in Niobium will be presented.