Abstract
We present the results of superconductivity, normal state magnetism, heat capacity and neutron diffraction of the La-site Pr substituted CaLa 1−xPr xBaCu 3O 7 system. The T c vs x behaviour of this system appears to be different than that predicted for orthorhombic La 1−xPr xBaCaCu 3O 7 system. Normal state dc magnetic measurements done in an applied field of 5kOe show a Curie-Weiss behaviour in terms of the paramagnetic moment of Pr. The effective paramagnetic moment of Pr appears to be the intermediate between that of the free Pr 3+/Pr 4+ known moments. For the non superconducting samples, i.e., for x=0.70 and 1.0, we observed an antiferromagnetic ordering temperature T N of nearly 4K for the former and 8K for the later from our dc magnetic and heat capacity measurements. The X-ray and neutron diffraction result show that Pr substitutes isostructurally until x=1.0 in CaLa 1−xPr xBaCu 3O 7 system with a few small intensity lines of unreacted BaCuO 2 and CaCuO 2. The lower T N of 8K for PrBaCaCu 3O 7 than the known 17K for PrBa 2Cu 3O 7 is presumably due to the intermixing of Pr and Ba site in the former compound.
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