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- W3147366931 abstract "The perpendicular and parallel magnetic critical fields of pure tin films and foils have been measured as a function of temperature (${1.3}^{ensuremath{circ}}mathrm{K}ensuremath{-}{T}_{c}$) and specimen thickness (500 AA{}-220 kAA{}). The critical field ${H}_{ensuremath{perp}}$ for specimens of thickness less than a critical thickness ${d}_{c}$ is in good agreement with Tinkham's vortex model for thin films if one assumes a thickness dependence for the penetration depth. For thicker films and foils the observed thickness dependence of ${H}_{ensuremath{perp}}$ is in good agreement with a theory based on the effect of positive surface energy on the free energy of the intermediate state. The measured parallel critical field ${H}_{ensuremath{parallel}}$ is in excellent agreement with Ginzburg-Landau theory for type-I superconductors in both the thin- and thick-film limits. For films thinner than a critical thickness ${{d}_{c}}^{ensuremath{'}}$, the transition is of second order and the relationship between ${H}_{ensuremath{perp}}$, ${H}_{ensuremath{parallel}}$, and the film thickness is in excellent agreement with the universal curve of Saint James and de Gennes for second-order transitions. For films thicker than ${{d}_{c}}^{ensuremath{'}}$, the transitions are of first order, and the critical fields approach the Ginzburg-Landau limit valid for $densuremath{gg}ensuremath{lambda}$. A comparison of the observed critical thicknesses ${d}_{c}$ and ${{d}_{c}}^{ensuremath{'}}$ with theoretical calculations has been made. From the data, bulk values for $ensuremath{kappa}(t)$, $ensuremath{lambda}(t)$, ${ensuremath{lambda}}_{L}(0)$, ${ensuremath{xi}}_{0}$, and $ensuremath{Delta}$ have been computed, and the thickness dependence of $ensuremath{kappa}(t)$ and $ensuremath{lambda}(t)$ has been estimated." @default.
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- W3147366931 date "1968-09-10" @default.
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- W3147366931 title "Magnetic Transitions of Superconducting Thin Films and Foils. II. Tin" @default.
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- W3147366931 doi "https://doi.org/10.1103/physrev.173.494" @default.
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