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Turbulent Structure and Characterization of '11'-type Iron-based Superconductors by Magneto-optical Imaging

Journal of Physics: Conference Series, ISSN: 1742-6596, Vol: 2545, Issue: 1
2023
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Conference Paper Description

Magneto-optical imaging is employed to investigate the vortex penetration modes in '11'-type iron-based superconductors (IBSs) Fe(Te0.6Se0.4) and FeSe single crystals. In Fe(Te0.6Se0.4), vortices penetrate mostly homogeneously from all edges, forming an unstable turbulent interface with pre-existing anti-vortices, where 'Meissner hole' emerges as those have been reported in '122'-type IBSs. In FeSe, however, the penetration is restricted to numerous mesoscopic stripe-like regions. Further experiments revealed an inhomogeneous vortex propagation pattern, where vortices are most likely to be channeled along the twin boundaries.

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