Determinations of upper critical field in the c-a plane

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Within a continuous Ginzburg-Landau model for layered superconductors, two procedures are proposed to determine the upper critical field parallel to the c-a crystal plane with an angle θ tilted from the c-axis. For an intrinsically layered superconductor, the upper critical fields for θ→ 90∘, as determined by the two procedures, are consistent with each other and in reasonably good agreement with those determined by similar procedures suited for the parallel upper critical field (θ= 90∘). The profile of the order parameter obtained at Bc₂ is Gaussian-like, indicating the plausibility of the procedures proposed.