Anisotropic pair-breaking by impurity doping in high-T sub(c) cuprates: modification of interlayer coupling

Impurity (Zn/Ni) doping effects on the superconducting coherence length xi and the penetration depth lambda have been studied for the in-plane and the out-of-plane directions of YBa sub(2)Cu sub(3)O sub(y) single crystals. We determined xi from diamagnetic susceptibility in the reversible region and...

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Bibliographic Details
Published in:Journal of low temperature physics 1999-01, Vol.117 (3), p.413-417
Main Authors: Tajima, S, Tomimoto, K, Wang, N L, Rykov, AI, Terasaki, I
Format: Article
Language:English
Subjects:
Anisotropy
Composition effects
Doping (additives)
Electron energy levels
Impurities
Magnetic susceptibility
Nickel
Single crystals
Temperature
Zinc
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Summary:Impurity (Zn/Ni) doping effects on the superconducting coherence length xi and the penetration depth lambda have been studied for the in-plane and the out-of-plane directions of YBa sub(2)Cu sub(3)O sub(y) single crystals. We determined xi from diamagnetic susceptibility in the reversible region and lambda from optical conductivity spectra. It was found that both in xi and lambda the ac-anisotropy ratio is reduced with impurity doping. Both changes can be explained by assuming an increase in Josephson coupling strength due to impurity doping.
ISSN:0022-2291