J. Phys. I France
Volume 5, Numéro 6, June 1995
Page(s) 623 - 630
DOI: 10.1051/jp1:1995155
J. Phys. I France 5 (1995) 623-630

Remarkable Influence of Heat Treatment on the Structural and Superconducting Properties of Y 1-xPr xSrBaCu 3O 6+z

A. Das and R. Suryanarayanan

Laboratoire de Physique des Solides de Bellevue, CNRS, 92195 Meudon, France

(Received 22 February 1995, revised 27 March 1995, accepted 19 April 1995)

Preparation, structural and superconducting properties of Y 1-xPr xSrBaCu 3O 6+z (YPSBCO) are reported. Preheating of the samples in argon prior to oxygen annealing not only increased the orthorhombic splitting but $T_{\rm c}$ also was enhanced by 5 to 14 K depending on x. Furthermore, this treatment induced superconductivity in the x=0.70 sample and $T_{\rm c}$ was found to be 14 K. The slope d $T_{\rm c}$/d x decreased considerably compared to Y 1-xPr xBa 2Cu 3O 6+z, where superconductivity was destroyed for $x\geq 0.55$. The data seem to indicate that a knowledge of the structural and defect chemistry is essential to understand the behaviour of Pr in YPSBCO.

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