Suppression of Superconductivity by Twin Boundaries in FeSe Thin Films

Details Suppression of Superconductivity by Twin Boundaries in FeSe Thin Films Suppression of Superconductivity by Twin Boundaries in FeSe Thin Films

2012-03-12

arxiv.org/abs/1203.2629v1

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures

Scientific paper

Low-temperature scanning tunneling microscopy and spectroscopy are employed to investigate twin boundaries in stoichiometric FeSe films grown by molecular beam epitaxy. Twin boundaries can be unambiguously identified by imaging the 90{\deg} change in the orientation of local electronic dimers from Fe site impurities on either side. Twin boundaries run at approximately 45{\deg} to the Fe-Fe bond directions, and noticeably suppress the superconducting gap, in contrast to the recent experimental and theoretical findings in other iron pnictides. Furthermore, vortices appear to accumulate on twin boundaries, consistent with the degraded superconductivity there. The variation in superconductivity is likely caused by the increased Se height in the vicinity of twin boundaries, providing the first local evidence for the importance of this height to the mechanism of superconductivity.

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