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High-temperature superconductivity in single-unit-cell FeSe films on anatase TiO2(001) | | Hao Ding
; Yan-Feng Lv
; Kun Zhao
; Wen-Lin Wang
; Lili Wang
; Can-Li Song
; Xi Chen
; Xu-Cun Ma
; Qi-Kun Xue
; | | Date: |
3 Mar 2016 | | Abstract: | The recent discovery of superconductivity with an exceptionally high critical
temperature (Tc) over 65 K in single-unit-cell (SUC) FeSe films on SrTiO3 has
received extensive attention. Whether SUC FeSe films can exhibit high-Tc
superconductivity on other substrates not only provides critical clues for
elucidating its mechanism, but also helps search for new superconductors by
interface engineering. Here we report the observation of high-Tc
superconductivity in SUC FeSe films on anatase TiO2(001), with various distinct
interfacial properties from SrTiO3. The comparison study has clarified the
crucial roles of substrate in realizing high-Tc superconductivity, primarily
via interfacial electron-phonon coupling and charge transfer. By visualizing
and tuning oxygen vacancies at the interface, we have found their very limited
effect on superconducting gap, which excludes interfacial oxygen vacancies as
the primary source of charge transfer. Our findings have placed severe
constraints on any microscopic model for the high-Tc superconductivity in
FeSe-related heterostructures. | | Source: | arXiv, 1603.0999 | | Services: | Forum | Review | PDF | Favorites | |
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