Strong vortex-antivortex fluctuations in the type II superconducting   film
  The small size vortex-antivortex pairs proliferation in type II superconducting film is considered for the wide interval of temperatures below Tc. The corresponding contribution to free energy is calculated. It is shown that these fluctuations give the main contribution to the heat capacity of the film both at low temperatures and in the vicinity of transition. 
Yu. N. Ovchinnikov, A. A. Varlamov