Visualization of vortex motion in FeAs-based BaFe<inf>1.9</inf>Ni<inf>0.1</inf>As<inf>2</inf>single crystal by means of magneto-optical imaging

Publication Type:
Journal Article
Citation:
Journal of Applied Physics, 2011, 109 (7)
Issue Date:
2011-04-01
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Superconductivity has been found in newly discovered iron-based compounds. This paper studies the motion of magnetic vortices in BaFe1.9Ni0.1As2single crystal by means of the magneto-optical imaging technique. A series of magneto-optical images reflecting magnetic flux distribution at the crystal surface were taken when the crystal was zero-field cooled to 10 K. The behavior of the vortices, including penetration into and expulsion from the single crystal with increasing and decreasing external fields, respectively, is discussed. The motion behavior is similar to that observed in high-Tcsuperconducting cuprates with strong vortex pinning; however, the flux-front is irregular due to randomly distributed defects in the crystal. © 2011 American Institute of Physics.
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