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    STUDIA PHYSICA - Issue no. 2 / 2007  
         
  Article:   TRANSPORT PHENOMENA AND AC-SUSCEPTIBILITY OF (BI;PB):2223 SUPERCONDUCTORS DOPED WITH SM IONS.

Authors:  M. BODEA, P. BALINT, T.R. YANG, A.V. POP, G. ILONCA.
 
       
         
  Abstract:  The effect of partial substitution of Ca by Sm on the structural, transport and magnetic properties of (Bi1.6Pb0.4)Sr2(Ca1-xSmx)2Cu3Oy superconductors ceramics (0 x 0.015) have been investigated. The substitution of Sm at the Ca site induced the decrease of the volume fraction for the 2223 phase and the increase of 2212 and 2201 phase volume fractions. The nature of Tc suppression may be attributed to the increase of oxygen content in Bi2O2 double layers with increasing Sm concentrations. The samples shows a linear dependence of intergranular temperature as a function of AC field amplitude, which is in agreement with Muller critical state model.  
         
     
         
         
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