FIZIKA A 4 (1995) 3, 591-598

HOMOGENEOUS LATTICE DISORDER AND SUPERCONDUCTING PROPERTIES OF YBa₂Cu₃O_6.9 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 Paiæ on the occasion of his 90^th birthday

Received 27 June 1995

We discuss the striking changes of the superconducting properties of YBa₂Cu₃O_6.9 films to the homogeneous lattice disorder, induced by varying growth temperatures: T_c 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 r_c » 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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