The investigation of EPR paramagnetic probe line width and shape   temperature dependence in high-temperature superconductors of   Bi-Pb-Sr-Ca-Cu-O system
  The work is related with the finding out of magnetic phases in strongly anisotropic high-temperature superconductor Bi1,7Pb0,3Sr2Ca2Cu3O10-d in the temperature region where the superconductor is in the normal state. It was studied the temperature dependence of the paramagnetic probe EPR line width. In the normal state at T>Tc near 175 K it was revealed a pick in the temperature dependence of line width. In this region it was observed the time increase of the line width with the characteristic time ~ 17 min. This shows the possibility of magnetic phase formation in this material. 
J.G.Chigvinadze, J.V.Acrivos, I.G.Akhvlediani, M.I.Chubabria,   T.L.Kalabegishvili, T.I.Sanadze