Dapeng Zhao, Wenqiang Cui, Yaowu Liu, Guanming Gong, Liguo Zhang, Guihao Jia, Yunyi Zang, Xiaopeng Hu, Ding Zhang, Yilin Wang, Wei Li, Shuaihua Ji, Lili Wang, Ke He, Xucun Ma, Qi-Kun Xue
One-unit-cell FeSe films on SrTiO3 substrates are of great interest owing to significantly enlarged pairing gaps characterized by two coherence peaks at ±10 meV and ±20 meV. In-situ transport measurement is desired to reveal novel properties. Here, we performed in-situ microscale electrical transport and combined scanning tunneling microscopy measurements on continuous one-unit-cell FeSe films with twin boundaries. We observed two spatially coexisting superconducting phases in domains and on boundaries, characterized by distinct superconducting gaps ( <mml:math xmlns:mml="https://www...
April 20, 2024: Nature Communications