Effective Dimensionality Change of Fluctuations in Superconductors in a Magnetic Field

In an external magnetic field and near the transition temperature T_c2(H), bulk and thin-film superconductors exhibit an effective change to one- and zero-dimensional behavior in their fluctuation specific heats, which diverge like (TT_c2-1)^-32 and (TT_c2-1)^-2, respectively. This enhancement effect is accompanied by a field-dependent broadening of the critical region.