Correlated vortex pinning in slightly orthorhombic twinned Ba(Fe1-xCox)(2)As-2 single crystals: Possible shift of the vortex-glass/liquid transition
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Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.
For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.
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Abstract
The interest in twin-boundary (TB) planes as a source of vortex pinning has been recently renewed with the discovery of the new iron-arsenide pnictide superconductors. In the family of compounds Ba(Fe1−xCox)2As2 a structural transition from a tetragonal to orthorhombic lattice takes place for compounds with xxcr) there is no twinning and we find good agreement with the expected scaling function under uncorrelated disorder, with small anisotropy values similar to those reported in the literature. We show that in the orthorhombic samples (x
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This article is published as Bermúdez, M. Marziali, G. Pasquini, Sergey L. Bud'ko, and Paul C. Canfield. "Correlated vortex pinning in slightly orthorhombic twinned Ba (Fe 1− x Co x) 2 As 2 single crystals: Possible shift of the vortex-glass/liquid transition." Physical Review B 87, no. 5 (2013): 054515. DOI: 10.1103/PhysRevB.87.054515. Posted with permission.