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Author (up) Nieva, G.; Ghamaty, S.; Lee, B. W.; Maple, M. B.; Schuller, I.K. openurl 
  Title Superconductivity and magnetism in Eu1-xPrxBa2Cu3O7-δ Type Journal Article
  Year 1991 Publication Physical Review B Abbreviated Journal Phys. Rev. B  
  Volume 44 Issue Pages 6999  
  Abstract Measurements of the electrical resistivity ρ as a function of temperature T, and low-temperature specific heat C as a function of T and magnetic field H, have been performed for Pr concentrations 0≤x≤1 in the Eu1-xPrxBa2Cu3O7-δ system (δ≊0.05). The superconducting critical temperature Tc(x) in the metallic phase (0≤x≲xc≊0.5) was determined from the resistivity ρ(x,T), while the Néel temperature TN(x) in the insulating phase (xc≲x≤1) was inferred from specific-heat anomalies due to antiferromagnetic (AFM) ordering of the Pr ions. The effect of ‘‘chemical’’ pressure on Tc(x) in the Y1-xPrxBa2Cu3O7-δ system is opposite to that of applied hydrostatic pressure. The Pr contributions to the specific heat in the insulating phase have the form C(T)=MT3 for T<TN, characteristic of three-dimensional AFM magnons. In contrast, the Pr contribution to C(T) in the metallic phase takes the form of a broad anomaly that can be described by a spin-1/2 Kondo model. The entropy associated with the Pr specific-heat anomalies in both the metallic and insulating phases is close to R ln2, indicative of a doublet ground state for Pr in the crystalline electric field and a Pr valence close to 4+.  
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  Call Number BT @ gnieva @ Serial 438  
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