SrTiO3上钾覆盖单层与双层FeSe薄膜中的超导二分性
超导电性
2015-12-21 v1
摘要
我们报道了SrTiO3(001)衬底上单原胞(1-UC)和2-UC FeSe薄膜随钾(K)吸附的超导演化。通过原位扫描隧道谱测量，我们发现1-UC FeSe薄膜中的超导随K覆盖度增加而被连续抑制，而非超导的2-UC FeSe薄膜则变为超导，其能隙约为17 meV或11 meV，取决于底层1-UC薄膜是否超导。该工作明确揭示，界面电声子耦合与FeSe/STO界面的电荷转移密切相关，并在增强1-UC和2-UC FeSe薄膜中的库珀配对方面起关键作用。
引用
@article{arxiv.1509.08950,
title = {Superconductivity dichotomy in K-coated single and double unit cell FeSe films on SrTiO3},
author = {Chenjia Tang and Ding Zhang and Yunyi Zang and Chong Liu and Guanyu Zhou and Zheng Li and Cheng Zheng and Xiaopeng Hu and Canli Song and Shuaihua Ji and Ke He and Xi Chen and Lili Wang and Xucun Ma and Qi-Kun Xue},
journal= {arXiv preprint arXiv:1509.08950},
year = {2015}
}