Superconductivity in a two monolayer thick indium film on Si(111) 3 × 3 -B
Physical Review B(2022)
Abstract
Two-monolayer-thick In film with a $\ensuremath{\surd}7\ifmmode\times\else\texttimes\fi{}\ensuremath{\surd}3$-rect structure is known to show superconductivity at 3.18 K on the $\mathrm{Si}(111)7\ifmmode\times\else\texttimes\fi{}7$ substrate. We synthesized the $\ensuremath{\surd}7\ifmmode\times\else\texttimes\fi{}\ensuremath{\surd}3$-In-rect film on the $\mathrm{Si}(111)\ensuremath{\surd}3\ifmmode\times\else\texttimes\fi{}\ensuremath{\surd}3\text{\ensuremath{-}}\mathrm{B}$ substrate and found that it also became a superconductor at ${T}_{c}$ = 2.38 K. The In film on the $\ensuremath{\surd}3\text{\ensuremath{-}}\mathrm{B}$ substrate showed the two-dimensional free-electron-like circular Fermi surface as on the $7\ifmmode\times\else\texttimes\fi{}7$ substrate. However, the butterfly-wing-like shape contour at the Fermi surface was found to be shifted and enlarged on the $\ensuremath{\surd}3\text{\ensuremath{-}}\mathrm{B}$ substrate. Density functional calculations revealed that it was caused by the difference of the substrate. ${T}_{c}$ on the $\ensuremath{\surd}3\text{\ensuremath{-}}\mathrm{B}$ substrate was considered to be identical to that on the $7\ifmmode\times\else\texttimes\fi{}7$ substrate in consideration of the recently reported surface defect density dependence of ${T}_{c}$. These results indicated that the interaction with the substrate does not play a crucial role in the superconductivity of the two-monolayer-thick In film.
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Key words
thick indium film,monolayer
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