Post-growth Fe deposition on the superconductivity of monolayer FeSe films on SrTi O3-δ
|Corresponding Author||Pan，Minghu; Wang，Lili|
The superconductivity in bulk FeSe depends sensitively on the stoichiometry, ditto for the monolayer FeSe films grown on SrTiO3-δ and other substrates. To tune the stoichiometry, we deposit Fe onto monolayer FeSe films after epitaxial growth. Using in situ low-temperature scanning tunneling microscopy/spectroscopy, we find that the postdeposited Fe atoms incorporate into monolayer films and combine with excess Se to form FeSe, with an upper coverage limit of ∼0.4 unit-cell. Consequently, the superconducting gap concentrates in 10 to 12 meV. The work demonstrates a simple method for stoichiometry tuning and improving the spatial uniformity of monolayer FeSe films. Compared with the gap of ∼15 to 20 meV for the annealed films, the smaller superconducting gap indicates weakened FeSe-TiO2 coupling due to interfacial Se atom substitution.
|WOS Accession No|
|EI Accession Number|
Binary alloys ; Iron ; Scanning tunneling microscopy ; Selenium ; Selenium compounds ; Stoichiometry ; Superconducting films ; Temperature ; Thin films ; Titanium dioxide
|ESI Classification Code|
Iron:545.1 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Thermodynamics:641.1 ; Superconducting Materials:708.3 ; Physical Chemistry:801.4 ; Inorganic Compounds:804.2
Cited Times [WOS]:1
|Document Type||Journal Article|
|Department||Department of Physics|
1.State Key Laboratory of Low-Dimensional Quantum Physics,Department of Physics,Tsinghua University,Beijing,100084,China
2.School of Physics & Information Technology,Shaanxi Normal University,Xian,710119,China
3.Beijing Academy of Quantum Information Sciences,Beijing,100193,China
4.Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China
Jiao，Xiaotong,Gong，Guanming,Zhang，Zhiyu,et al. Post-growth Fe deposition on the superconductivity of monolayer FeSe films on SrTi O3-δ[J]. Physical Review Materials,2022,6(6).
Jiao，Xiaotong.,Gong，Guanming.,Zhang，Zhiyu.,Dong，Wenfeng.,Ding，Cui.,...&Xue，Qi Kun.(2022).Post-growth Fe deposition on the superconductivity of monolayer FeSe films on SrTi O3-δ.Physical Review Materials,6(6).
Jiao，Xiaotong,et al."Post-growth Fe deposition on the superconductivity of monolayer FeSe films on SrTi O3-δ".Physical Review Materials 6.6(2022).
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