For two- and three-layer superconductors, the Gaussian fluctuation contributions are computed exactly, and the critical exponent dips below the 2D value while the effective number of independent fluctuating planes crosses over from 1 to N.
Phys Rev B 95:214506
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Dimensional crossovers in the Gaussian critical fluctuations above $T_c$ of two-layer and three-layer superconductors
For two- and three-layer superconductors, the Gaussian fluctuation contributions are computed exactly, and the critical exponent dips below the 2D value while the effective number of independent fluctuating planes crosses over from 1 to N.