Electronic inhomogeneity and phase fluctuation in one-unit-cell FeSe films

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 and Qi-Kun Xue ()
Additional contact information
Dapeng Zhao: Beijing Academy of Quantum Information Sciences
Wenqiang Cui: Beijing Academy of Quantum Information Sciences
Yaowu Liu: Tsinghua University
Guanming Gong: Tsinghua University
Liguo Zhang: Beijing Academy of Quantum Information Sciences
Guihao Jia: Tsinghua University
Yunyi Zang: Beijing Academy of Quantum Information Sciences
Xiaopeng Hu: Tsinghua University
Ding Zhang: Beijing Academy of Quantum Information Sciences
Yilin Wang: Shandong University
Wei Li: Tsinghua University
Shuaihua Ji: Tsinghua University
Lili Wang: Tsinghua University
Ke He: Beijing Academy of Quantum Information Sciences
Xucun Ma: Tsinghua University
Qi-Kun Xue: Beijing Academy of Quantum Information Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract 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 ( $${\Delta }_{1}$$ Δ 1 ~15 meV vs. $${\Delta }_{2}$$ Δ 2 ~10 meV) and pairing temperatures (Tp1~52.0 K vs. Tp2~37.3 K), and correspondingly two-step nonlinear $$V \sim {I}^{\alpha }$$ V ~ I α behavior but a concurrent Berezinskii–Kosterlitz–Thouless (BKT)-like transition occurring at $${T}_{{{{{{\rm{BKT}}}}}}}$$ T BKT ~28.7 K. Moreover, the onset transition temperature $${T}_{{{{{{\rm{c}}}}}}}^{{{{{{\rm{onset}}}}}}}$$ T c onset ~54 K and zero-resistivity temperature $${T}_{{{{{{\rm{c}}}}}}}^{{{{{{\rm{zero}}}}}}}$$ T c zero ~31 K are consistent with Tp1 and $${T}_{{{{{{\rm{BKT}}}}}}}$$ T BKT , respectively. Our results indicate the broadened superconducting transition in FeSe/SrTiO3 is related to intrinsic electronic inhomogeneity due to distinct two-gap features and phase fluctuations of two-dimensional superconductivity.

Date: 2024
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DOI: 10.1038/s41467-024-47350-0

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