Vortex imaging in Co-doped BaFe2As2 |
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| Authors: | MR Eskildsen LYa Vinnikov IS Veshchunov TM Artemova TD Blasius JM Densmore CD Dewhurst N Ni A Kreyssig SL Bud’ko PC Canfield AI Goldman |
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| Institution: | 1. Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA;2. Institute of Solid State Physics Russian Academy of Sciences, Chernogolovka, Moscow Region 142432, Russia;3. Institut Laue-Langevin, 6 Rue Jules Horowitz, F-38042 Grenoble, France;4. Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA |
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| Abstract: | We review superconducting vortex imaging in Co-doped BaFe2As2 by Bitter decoration and small-angle neutron scattering (SANS). At all measured fields a highly disordered vortex configuration is observed, which is attributed to strong pinning. Further support of this conclusion comes from the absence of a Meissner rim in decoration images obtained close to the sample edge. The evolution of the SANS scattering vector with increasing applied field indicates vortex lattice domains of (distorted) hexagonal symmetry. This is consistent with the decoration images which show small, six fold coordinated ordered vortex domains. The SANS scattered intensity is found to decrease rapidly with increasing field, exceeding the rate expected from estimates of the upper critical field. This is consistent with the large degree of vortex “lattice” disorder. |
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