FIZIKA A 4 (1995) 3, 591-598

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HOMOGENEOUS LATTICE DISORDER AND SUPERCONDUCTING PROPERTIES OF YBa2Cu3O6.9 FILMS

DAVOR PAVUNA and ANDREA GAUZZI
Department of Physics, Swiss Federal Institute of Technology at Lausanne (EPFL), CH - 1015 Lausanne, Switzerland

Dedicated to Professor Mladen PaiŠ on the occasion of his 90th birthday

Received 27 June 1995

We discuss the striking changes of the superconducting properties of YBa2Cu3O6.9 films to the homogeneous lattice disorder, induced by varying growth temperatures: Tc decreases with increasing disorder, while the width of the resistive transition and the normal state resistivity increase. We estimate the length scale of such dis- order from the broadening DJ of the < 005 > X-ray diffraction rocking curves. The suppression of superconductivity and normal conductivity scales as DJ and appears for in-plane lattice coherence lengths rc 1/DJ smaller than about 10 nm.

UDC 538.945, 539.213
PACS 61.43.-j, 74.76.-w, 74.62.Dh
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