PIGNON, Bruno; AUTRET-LAMBERT, Cécile; RUYTER, Antoine; DECOURT, Rodolphe; BASSAT, Jean-Marc.; MONOT-LAFFEZ, I.; AMMOR, Larbi

doi:10.1016/j.physc.2007.09.014

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PIGNON, Bruno
GREMAN (matériaux, microélectronique, acoustique et nanotechnologies) [GREMAN]

AUTRET-LAMBERT, Cécile
GREMAN (matériaux, microélectronique, acoustique et nanotechnologies) [GREMAN]

RUYTER, Antoine
GREMAN (matériaux, microélectronique, acoustique et nanotechnologies) [GREMAN]

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Physica C: Superconductivity and its Applications. 2008, vol. 468, n° 11-12, p. 865-871

Elsevier

Résumé en anglais

The effects of yttrium Y and zinc Zn substitution on calcium Ca and cupper Cu sites in Bi2Sr2CaCu2O8+δ compounds have been investigated by resistivity measurements. At high temperature, after a superconducting transition, the electrical behaviour evolves from a metallic state in compounds with a weak Y concentration into a semi-conducting state (hopping conduction) in compounds with a large Y concentration. Similarly, the Zn substitution modifies the electrical behaviour from metallic to insulating with a much lower concentration comparatively to Y. In the two cases, the semi-conducting behaviour is described by hopping between localised states in the conduction band. This localization is explained by the random distribution of the doping elements which originates from the Y/Zn and Cu wave-functions overlap. The obtained results show the localization is improved in the case of Zn. Consequently, it is suggested that the direct substitution of Zn into the planes leads to a greater overlap. Moreover, the superconducting transition (critical temperature: TC) shows an irregular depression when Zn is substituted. According to an X-Ray diffraction study, this result can be interpreted by internal micro-strains in the structure.< Réduire

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Bi-2212

Y and Zn codoping

Transport properties

Inhomogeneity

Localization

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Study of the yttrium and zinc substitutions effects in Bi2Sr2CaCu2O8+δ compounds by transport measurements

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