L. Colonescu et al., Delocalization of holes and restitution of superconductivity in Pr substituted at rare earth and Ba site in LnBa(2)Cu(3)O(7) (Ln = Nd, Sm), PHYSICA B, 261, 1999, pp. 528-529
Pr substituted at Sm site in SmBa2Cu3O7 did not induce any orthorhombic to
tetragonal transition whereas 15% of Pr at Ba site did. Superconductivity w
as destroyed with 45% of Pr at Sm site or 15% of Pr at Pa site. However, Sr
substitution at Pa site in both the cases restored it. Similar data were o
btained in the case of Pr in NdBa2Cu3O7. Our data seem to suggest different
mechanisms for hole delocalization operate depending on the site occupatio
n of Pr. (C) 1999 Elsevier Science B.V. All rights reserved.