posted on 2024-11-16, 08:20authored byZhi W Lin, Yong Jian Li, Jian G Zhu, Xiaolin WangXiaolin Wang, Shi DouShi Dou, Youguang Guo, Gang Lei, Yi Wang, Matthew Philips, Michael Cortie, Yan-Cheng Li, Ki-Young Choi, Xun Shi
Superconductivity has been found in newly discovered iron-based compounds. This paper studies the motion of magnetic vortices in BaFe1.9Ni0.1As2 single 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-Tc superconducting cuprates with strong vortex pinning; however, the flux-front is irregular due to randomly distributed defects in the crystal.
Funding
Current limiting mechanisms in magnesium diboride superconductors
Lin, Z. W., Li, Y., Zhu, J. G., Wang, X., Dou, S. Xue., Guo, Y., Lei, G., Wang, Y., Philips, M., Cortie, M., Li, Y., Choi, K. & Shi, X. (2011). Visualization of vortex motion in FeAs-based BaFe1.9Ni0.1As2 single crystal by means of magneto-optical imaging. Journal of applied physics, 109 (7), 07E142-07E145.