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• W2912039922 abstract "Unlike monolayer Fe-Chalcogenide (Fe-$Ch$)$/mathrm{SrTi}{mathrm{O}}_{3}$ (STO), which possesses the potential for high-temperature superconductivity (HTS), a regular Fe-$Ch$ thin film grown on a non-STO substrate by the pulsed laser deposition method shows totally different superconducting behavior and a different mechanism. Although regular Fe-$Ch$ thick films grown on $mathrm{Ca}{mathrm{F}}_{2}$ generally show the highest superconducting transition temperature (${T}_{mathrm{c}}$) compared with any other substrates, the disappearance of superconductivity always takes place when the thickness of the Fe-$Ch$ film is reduced to a critical value ($ensuremath{sim}20phantom{rule{0.16em}{0ex}}mathrm{nm}$ for Fe-Se and $ensuremath{sim}30phantom{rule{0.16em}{0ex}}mathrm{nm}$ for Fe-Se-Te) with the reason still under debate. Here, we report an enhanced ${T}_{mathrm{c}}ensuremath{approx}17.6phantom{rule{0.16em}{0ex}}mathrm{K}$ in a 7-nm-FeTe/7-nm-FeSe bilayer heterostructure grown on $mathrm{Ca}{mathrm{F}}_{2}$ substrate. Generally, the Fe-$Ch$ film on $mathrm{Ca}{mathrm{F}}_{2}$ is supposed to be one order of magnitude greater in thickness to achieve similar performance. Hall measurements manifest the dominant nature of hole-type carriers in the films in this work, which is similar to the case of a pressurized bulk FeSe single crystal, while in sharp contrast to heavily electron-doped HTS Fe-$Ch$ systems. According to the electron energy loss spectroscopy results, we observed direct evidence of nanoscale phase separation in the form of a fluctuation of the Fe-${L}_{3}/{L}_{2}$ ratio near the FeTe/FeSe interface. In detail, a several-unit-cell-thick Fe(Se,Te) diffusion layer shows a higher Fe-${L}_{3}/{L}_{2}$ ratio than either an FeTe or an FeSe layer, indicating low Fe $3d$ electron occupancy, which is, to some extent, consistent with the hole-dominant scenario obtained from the Hall results. It also implies a possible relationship between the state of Fe $3d$ electron occupancy and the enhanced ${T}_{mathrm{c}}$ in this work. Our work clarifies the importance of the FeTe/FeSe interface in reviving the superconductivity in Fe-$Ch$ ultrathin films, contributing to a more unified understanding of unconventional Fe-$Ch$ superconductivity." @default.
• W2912039922 created "2019-02-21" @default.
• W2912039922 creator A5001817163 @default.
• W2912039922 creator A5009561241 @default.
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• W2912039922 creator A5027048208 @default.
• W2912039922 creator A5028780342 @default.
• W2912039922 creator A5044691936 @default.
• W2912039922 creator A5046029115 @default.
• W2912039922 creator A5048943029 @default.
• W2912039922 creator A5053260204 @default.
• W2912039922 creator A5053837836 @default.
• W2912039922 creator A5088452498 @default.
• W2912039922 date "2019-02-08" @default.
• W2912039922 modified "2023-10-17" @default.
• W2912039922 title "Enhanced superconductivity induced by several-unit-cells diffusion in an FeTe/FeSe bilayer heterostructure" @default.
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