A possibility of large superconducting gap in the presence of quantum fluctuations

According to the BCS model the probability of electron states filling vk2 as a function of kinetic energy is smeared. A modified mechanism of vk2 formation is proposed which takes the fluctuations near the quantum phase transition into account. The estimations of a superconducting gap in the presence of fluctuations for a material with HTS parameters give values comparable with those observed. The characteristic features of the proposed model resemble the properties of HTS.