A possibility of kinetic energy economy at the transition of   two-dimensional conductor to the superconducting state
  For a two-dimensional conductor under the conditions of the Bardeen-Cooper-Schrieffer mechanism of superconductivity, a factor resulting in economy in kinetic energy upon the transition to the superconducting state and connected to the zero oscillations of macroscopic quantum oscillator is offered. The economy, in as turn, can result in greater rigity of superconducting state. 
I. N. Zhilyaev