= Pair formation and phase ordering
Pairing can establish a local binding or gap scale before a system develops phase-coherent transport. An actual <superconducting transition temperature> depends on both the pair scale and the <phase stiffness>. Low carrier density or weak interlayer coupling can make phase ordering the lower scale even when the pairing amplitude is appreciable. A minimum or smooth interpolation of two estimated scales is a qualitative guide, not a substitute for a self-consistent theory of the crossover.
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