Suppression of Superconductivity by Twin Boundaries In FeSe
Xue, Qi-KunNote: Order does not necessarily reflect citation order of authors.
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CitationSong, Can-Li, Yi-Lin Wang, Ye-Ping Jiang, Lili Wang, Ke He, Xi Chen, Jennifer E. Hoffman, Xu-Cun Ma, and Qi-Kun Xue. 2012. Suppression of superconductivity by twin boundaries in FeSe. Physical Review Letters 109(13): 137004.
AbstractLow-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 90º change in the orientation of local electronic dimers from Fe site impurities on either side. Twin boundaries run at approximately 45º to the Fe-Fe bond directions, and noticeably suppress the superconducting gap, in contrast with 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.
Citable link to this pagehttp://nrs.harvard.edu/urn-3:HUL.InstRepos:9925388
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