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09 December 2022
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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
AbstractThe 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
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