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    STUDIA PHYSICA - Issue no. 1 / 2004  
         
  Article:   STUDY BY MAGNETICALLY MODULATED MICROWAVE ABSORPTION OF BI1.7PB0.4SR1.5CA2.5CU3.6OX/ (LIF)Y SUPERCONDUCTING SYSTEM.

Authors:  M. VELTER-STEFANESCU, O.G. DULIU, V. MIHALACHE, I. URSU.
 
       
         
  Abstract:  High temperature superconducting system Bi1.7Pb0.4Sr1.5Ca2.5Cu3.6Ox/ (LiF)y was investigated by magnetically modulated microwave absorption (MAMMA), evidencing the effect of LiF content on 2223 phase critical state. The experimental results show a significant growth (about three time) of the 2223 superconducting phase content and a slightly increase (around 2 %) of the critical temperature for y ~ 0.07. Moreover, for y between 0.05 and 0.12, we have noticed that the ratio is practically constant and equal to (18.5 ▒ 1.5) KT-1, typical value for 2223 superconducting phase. Key words: Magnetically modulated microwave absorption, High temperature superconductivity, Critical state, Critical current density  
         
     
         
         
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