Ubiquitous stripe phase and enhanced electron pairing in the interfacial high-Tc superconductor FeSe/BaTiO3
Xuemin Fan, Wenqiang Cui, Yonghao Yuan, Qi-Kun Xue, Wei Li
DOI 10.1103/PhysRevB.106.024517 · Physical Review B
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Abstract
Monolayer FeSe grown on SrTiO3 provides a playground for high-Tc superconductivity. Authors of a recent study have shown the importance of stripy instability for superconductivity enhancement in FeSe/SrTiO3. However, it is still under debate whether such a stripe phase is ubiquitously bound to the interfacial superconductivity. Here, we report on molecular beam epitaxy growth and a low-temperature scanning tunneling microscopy study of FeSe films on BaTiO3(001). We find that the stripe phase is more prominent in FeSe/BaTiO3. Long-range stripes exist in bilayer and triple-layer FeSe films at 4 K and even persist up to 77 K in the case of bilayer FeSe, with enlarged superconducting gaps upon alkali-metal deposition. The results point out an intimate correlation between the interfacial superconductivity and the stripe phase.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 65 | Pressure not reported | onset |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 75 | Pressure not reported | onset |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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