On the Applicability Ranges of Tc Formulas for Proximity-Coupled Thin SN and SS Bilayers
Abstract
This brief note revisits the well-established Tc formulas for proximity-coupled thin superconductor-normal conductor (SN) and superconductor-superconductor (SS) bilayers, highlighting their relationships and clarifying their ranges of applicability. Since these formulas are often misapplied in practical contexts, this note provides guidance for their correct use in experimental and applied settings. For SN bilayers, McMillan's formula is recommended for its broad applicability, with its SS counterpart offering similar reliability.
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