Abstract

Cobalt-doping of Bi 2Sr 2CaCu 2O x beyond a critical level of 1.5–1.7 at % produces both a large decrease in the superconducting transition critical temperature and all of the classic symptoms of Anderson localization. These include: a negative slope of the ab-plane resistivity vs temperature, no dispersing states near the Fermi level and a decrease of the photoemission signal in the same region.

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