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• W4362653610 abstract "Ultrathin superconducting films with high transition temperature and high critical magnetic field are desirable for many potential applications, such as single photon detector and hybrid superconductor-topological material structure for quantum computing. MgB <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> is one of the highest <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex-math notation=LaTeX>${T}_c$</tex-math></inline-formula> <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>s</i> -wave superconductors and therefore is very promising for these applications. In this work, we studied the superconducting transition of ultrathin MgB <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> film with film thickness in the nanometer scale. The <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex-math notation=LaTeX>${T}_c$</tex-math></inline-formula> of the nominal 3 nm- thick film is above 30 K. The upper critical field exhibits a good agreement with the phenomenological Ginzburg-Landau expression for a 2D superconducting film, <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>i.e.</i> , <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex-math notation=LaTeX>$B_{c2}^ bot propto 1 - T/{T}_c$</tex-math></inline-formula> for an out-of-plane magnetic field and <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex-math notation=LaTeX>$B_{c2}^parallel propto {({1 - T/{T}_c})}^{0.5}$</tex-math></inline-formula> for an in-plane magnetic field. The extrapolation of upper critical field yields <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex-math notation=LaTeX>$B_{c2}^ bot ({0 mathrm{K}}) = 7.5 mathrm{T}$</tex-math></inline-formula> and <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex-math notation=LaTeX>$B_{c2}^parallel ({0 mathrm{K}}) = 70 mathrm{T}$</tex-math></inline-formula> in a 3 nm- thick film. The large anisotropy indicates that the superconductivity of ultrathin MgB <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> film is strongly 2D in nature. The angular dependence of the upper critical field <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex-math notation=LaTeX>${B}_{c2}(theta)$</tex-math></inline-formula> shows a sharp cusp feature when the magnetic field is parallel to the film. The 2D Tinkham model could describe the trend of angular dependent upper critical field, which once again indicates the 2D superconducting nature of the MgB <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> films." @default.
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• W4362653610 date "2023-08-01" @default.
• W4362653610 modified "2023-09-27" @default.
• W4362653610 title "Anisotropic High Upper Critical Field in Ultrathin MgB₂ Film" @default.
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• W4362653610 doi "https://doi.org/10.1109/tasc.2023.3264173" @default.
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