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Author (up) Iwasaki, H.; Dalichaouch, Y.; Markert, J.T.; Nieva, G.; Seaman, C.L.; Maple, M.B. openurl 
  Title On narrowing of the resistive superconducting transition in applied magnetic fields and positive curvature in Hc2(T) in the (Gd1−xPrx)Ba2Cu3O7−δ system Type Journal Article
  Year 1990 Publication Physica C: Superconductivity Abbreviated Journal Physica C  
  Volume 169 Issue 1-2 Pages 146-151  
  Keywords  
  Abstract The superconducting transition temperature Tc and the temperature dependence of the upper critical field Hc2 were measured resistively on polycrystalline samples in the (Gd1−xPrx)Ba2Cu3O7−δ system. The experimental results reveal that Tc decreases monotonically with increasing x and vanishes at x≈0.49. Whereas Hc2 of a sample with x=0.10 has an almost linear temperature dependence and the superconducting transition broadens with increasing magnetic field, a sample with x=0.45 shows strong positive curvature in the Hc2 versus temperature curve and narrowing of the superconducting transition width with increasing magnetic field. Both phenomena observed in the sample with x=0.45 can be explained qualitatively in terms of a negative exchange interaction between the superconducting charge carriers and the Pr 4f electrons.  
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  Call Number BT @ gnieva @ Serial 436  
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