Temperature dependence investigation of dissipation processes in   strongly anisotropic high-temperature superconductors of Bi-Pb-Sr-Ca-Cu-O   system synthesized using solar energy
  The investigation of temperature dependence of damping and period of vibrations of HTSC superconductive cylinder of Bi-Pb-Sr-Ca-Cu-O system suspended by a thin elastic thread and performing axial-torsional vibrations in a magnetic field at temperatures above the critical one for the main phase Tc=107 K were carried out. It was observed some "chaos" temperature region in the temperature interval 107-138 K, where it is seen separate ripples of dissipation and oscillation frequency. It is assumed that the "chaos" region could point to a possibility of existence of other magnetic and more high-temperature phases as single islands in a normal materials matrix. 
J.G.Chigvinadze, J.V.Acrivos, S.M.Ashimov, D.D.Gulamova,   T.V.Machaidze, D.Uskenbaev