Home » Node » Vortices in superconducting Ba(Fe0.93Co0.07)(2)As-2 studied via small-angle neutron scattering and Bitter decoration

Vortices in superconducting Ba(Fe0.93Co0.07)(2)As-2 studied via small-angle neutron scattering and Bitter decoration

TitleVortices in superconducting Ba(Fe0.93Co0.07)(2)As-2 studied via small-angle neutron scattering and Bitter decoration
Publication TypeJournal Article
Year of Publication2009
AuthorsEskildsen MR, Vinnikov LY, Blasius TD, Veshchunov IS, Artemova TM, Densmore JM, Dewhurst CD, Ni N, Kreyssig A, Bud'ko SL, Canfield PC, Goldman AI
Journal TitlePhysical Review B
Volume79
Pages100501
Date Published03/01
ISBN Number1098-0121
Accession NumberISI:000264768600018
Keywords43 k, barium compounds, cobalt compounds, field, flux pinning, flux-line-lattice, iron compounds, neutron diffraction, phase, superconducting critical field, superconducting materials, transition
Abstract

We present small-angle neutron scattering (SANS) and Bitter decoration studies of the superconducting vortices in Ba(Fe0.93Co0.07)(2)As-2. A highly disordered vortex configuration is observed at all measured fields and is attributed to strong pinning. This conclusion is supported by the absence of a Meissner rim in decoration images obtained close to the sample edge. The field dependence of the magnitude of the SANS scattering vector indicates vortex lattice domains of (distorted) hexagonal symmetry, consistent with the decoration images which show primarily sixfold coordinated vortex domains. An analysis of the scattered intensity shows that this decreases much more rapidly than expected from estimates of the upper critical field, consistent with the large degree of disorder.
URL<Go to ISI>://000264768600018
DOI10.1103/Physrevb.79.100501