EFFECT OF ISOVALENT AND NON-ISOVALENT SUBSTITUTIONS ON SUPERCONDUCTIVITY IN NDBA2-XPRXCU3O7

Authors
COLONESCU L BERTHON J SURYANARAYANAN R ZELENAY I
Citation
L. Colonescu et al., EFFECT OF ISOVALENT AND NON-ISOVALENT SUBSTITUTIONS ON SUPERCONDUCTIVITY IN NDBA2-XPRXCU3O7, Physica. C, Superconductivity, 291(1-2), 1997, pp. 85-89
Citations number
18
Journal title
Physica. C, Superconductivity → ACNP
ISSN journal
09214534
Volume
291
Issue
1-2
Year of publication
1997
Pages
85 - 89
Database
ISI
SICI code
0921-4534(1997)291:1-2<85:EOIANS>2.0.ZU;2-F
Abstract
We have compared for the first time the structural and superconducting properties of (A) NdBa2-xPrxCu3O7 and (B) Nd1-uPruBa2Cu3O7. An orthor hombic to tetragonal transition was found in A for x > 0.2 whereas for B no such transition has been reported. In both cases superconductivi ty was destroyed for x = 0.3 and u = 0.3 and could be restored by isov alent Sr substitution. However, Ca substitution at the Nd site restore d superconductivity only in the case of A. Our results indicate that d ifferent mechanisms have to be invoked to account for the suppression of superconductivity in compounds A and B. (C) 1997 Elsevier Science B .V.