Superconducting properties of a 3D TI-bipolaron gas in magnetic field

Consideration is given to thermodynamical properties of a three-dimensional Bose-condensate of translation-invariant bipolarons (TI-bipolarons). The critical temperature of transition, energy, heat capacity and the transition heat of TI-bipolaron gas are calculated. The generalization of theory on the case of magnetic field is made. Such values as maximum magnetic field when Bose-condensate exists, London penetration depth and their temperature dependencies are calculated. The results obtained are used to explain experiments on high-temperature superconductors.