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    STUDIA PHYSICA - Issue no. 2 / 2011  
         
  Article:   EFFECT OF NANODEFECTS INDUCED BY 4F ELEMENTS ON DISSIPATIVE PROCESSES IN SINTERED SUPERCONDUCTORS.

Authors:  D. MARCONI, V. POP, A.V. POP.
 
       
         
  Abstract:  By using solid state reaction method the (Bi,Pb):2223 single phase superconducting samples were obtained. The influence of partial substitution of Ca by 4f elements (Er, Lu) and Y on structure and purity of 2223 phase is analyzed by XRD measurements. The effect of nanoscale defects induced by 4 f elements on the intergranular dissipation processes is characterized from a.c. magnetic susceptibility function of temperature and a.c. field amplitude. The maximum value of critical current density obtained for a critical xc value of partial substitution is discussed in relation with the increase of pinning force.

Keywords: HTS synthesis, nanodefects, X-ray diffraction, a.c. susceptibility 

 
         
     
         
         
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