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- W2023170897 abstract "We present the superconducting and critical current properties of ${text{ZnNNi}}_{3}$ in the form of annularly coated carbon microfibers and thin films. The fibers were prepared by heating $6--8text{ }ensuremath{mu}text{m}$ diameter commercially available Ni-coated carbon fibers with Zn powder in a flowing stream of ${text{NH}}_{3}$ gas at $650text{ }ifmmode^circelsetextdegreefi{}text{C}$. The fibers had a ${T}_{c}=3.75text{ }text{K}$, which was slightly higher than that of the polycrystalline powder and an upper critical field, ${H}_{c2}(0)=0.92text{ }text{T}$. Near the transition temperature ${T}_{c}$, the critical current density ${J}_{c}$ was well described by the Ginzburg-Landau power-law form ${[1ensuremath{-}{(T/{T}_{c})}^{2}]}^{3/2}$. The extrapolation produces ${J}_{c}(0)ensuremath{cong}1.45ifmmodetimeselsetexttimesfi{}{10}^{6}text{ }text{A}/{text{cm}}^{2}$. An axial magnetic field produces an exponential decrease in the critical current density. Planar ${text{ZnNNi}}_{3}$ films were formed on sapphire substrates by exposing thin Ni films to a similar heat treatment as the fibers. Hall measurements on the films in the normal state revealed a carrier density, $n=ensuremath{-}1.46ifmmodetimeselsetexttimesfi{}{10}^{23}text{ }{text{cm}}^{ensuremath{-}3}$." @default.
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- W2023170897 date "2009-06-12" @default.
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- W2023170897 title "Superconducting and magnetotransport properties of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mtext>ZnNNi</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>microfibers and films" @default.
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- W2023170897 doi "https://doi.org/10.1103/physrevb.79.212508" @default.
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