Magnetoresistance peculiarities and magnetization of materials with two   kinds of superconducting inclusions
  Low-temperature properties of a crystal containing superconducting inclusions of two different materials have been studied. In the approximation that the size of inclusions is much smaller than the coherence length/penetration depth of the magnetic field the theory for magnetoresistance of a crystal containing spherical superconducting inclusions of two different materials has been developed, and magnetization of crystals has been calculated. 
Oksana N. Shevtsova
cond-mat.supr-con