期刊
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
卷 469, 期 9-12, 页码 529-534出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physc.2009.03.042
关键词
Vortex imaging; Pnictides
资金
- National Science Foundation [DMR-0804887, PHY-0552843]
- Department of Energy, Basic Energy Sciences [DE-AC02-07CH11358]
- [RFBR 07-02-00174]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0804887] Funding Source: National Science Foundation
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. (C) 2009 Elsevier B.V. All rights reserved.
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