Low-field vortex patterns in the multiband BaFe2−xNixAs2 superconductor (x = 0.1, 0.16)
L. J. Li, T. Nishio, Z. A. Xu, V. V. Moshchalkov
DOI 10.1103/PhysRevB.83.224522 · Physical Review B
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Abstract
The distribution of vortices at low magnetic fields in single crystals of multiband BaFe2−xNixAs2 (x = 0.1 and x = 0.16) superconductors is studied by Bitter decoration. Highly inhomogeneous vortex patterns, including vortex stripes and vortex clusters, are observed. The origin of these inhomogeneous vortex arrays is likely to be due to strong flux pinning, as suggested by magnetization measurements performed at high fields. Alternative possible scenarios, such as type-1.5 superconductivity due to multiband effect, are also discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaFe2-xNixAs2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20.5 | Pressure not reported | onset |
| BaFe2-xNixAs2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.5 | Pressure not reported | onset |
| NbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.2 | Pressure not reported | unknown |
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