Abstract
Abstract Substitution effects of cobalt for copper on the electrical resistivity in two-legged ladder compound, Sr14Cu24−xCoxO41 are investigated. Polycrystalline samples of single phase with cobalt concentration up to x=5 are prepared. The electrical resistivity of Sr14Cu24−xCoxO41 for all x shows semiconductive behavior. It is found, however, that for cobalt concentration with x⩾3 the value of the resistivity decreases with cobalt concentration x. The effect of cobalt substitution with x=5 on resistivity is almost equivalent to that of Ca substitution for Sr with y=6 in Sr14−yCayCu24O41.
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