Superconducting transition of FeSe/SrTiO3 induced by adsorption of semiconducting organic molecules
Jiaqi Guan, Jian Liu, Bing Liu, Xiaochun Huang, Qing Zhu, Xuetao Zhu, Jiatao Sun, Sheng Meng, Weihua Wang, Jiandong Guo
DOI 10.1103/PhysRevB.95.205405 · Physical Review B
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Abstract
We prepared superconducting and nonsuperconducting FeSe films on SrTiO3(001) substrates (FeSe/STO) and investigated the superconducting transition induced by charge transfer between organic molecules and FeSe layers by low temperature scanning tunneling microscopy and spectroscopy. At low coverage, donor- and acceptor-type molecules adsorbed preferentially on the nonsuperconducting and superconducting FeSe layers, respectively. Superconductivity was induced by donor molecules on nonsuperconducting FeSe layer, while the superconductivity was suppressed near acceptor molecules. The corresponding evolutions of electronic states and work function were also resolved by scanning tunneling microscopy. These results illustrate the important role played by local electron concentration in the superconducting transition of FeSe/STO.
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. | — | Pressure not reported | unknown |
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