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    STUDIA PHYSICA - Ediţia nr.1 din 2005  
         
  Articol:   DIRECT MICROWAVE ABSORPTION INVESTIGATION OF THE YBa2Cu3O7-:Li SUPERCONDUCTOR SYSTEM.

Autori:  M. VELTER-STEFANESCU, O.G. DULIU, V. SANDU, I. URSU. 		 
       
         
  Rezumat:  Neutron irradiated Li (2 at. %.) doped YBa2Cu3O7 system has been investigated by direct microwave absorption. After irradiation, the superconducting properties of the 123 phase were modified depending on the neutron fluency. Increasing the fluency, the phase structure supports initially a disordering, then a re-ordering accompanied by a significant increase of the average critical temperature Tc after 5 1017cm-2 irradiation; at the highest fluency (1018cm-2) Tc decreases denoting the degradation of the 123 the phase. The intragranular dephasing magnetic field Bd, i.e. the DMA parameter associated with the magnetic field dependence of the critical current density, reflects the evolution of the material structure, initially decreasing after first irradiation (5 1017cm-2) and then increasing at higher fluencies. Another interesting peculiarity, consisting of the presence of a flatness of the DMA curves around 0.5 T, and that exists only in irradiated samples, was interpreted as a peak effect.  
         
     
         
         
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