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26 April 2024 |
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Article overview
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Suppression of Superconductivity by Twin Boundaries in FeSe Thin Films | | Can-Li Song
; Yi-Lin Wang
; Ye-Ping Jiang
; Lili Wang
; Ke He
; Xi Chen
; Jennifer E Hoffman
; Xu-Cun Ma
; Qi-Kun Xue
; | | Date: |
12 Mar 2012 | | Abstract: | 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. | | Source: | arXiv, 1203.2629 | | Services: | Forum | Review | PDF | Favorites | |
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