Electrical resistivity of La1−xSrxCoO3 is reduced significantly by the substitution of Ni3+ ions in place of the cobalt ions. In the La1−xSrxCo1−yNiyO3 system, for small values ofx(x=0·05) superparamagnetic clusters seem to be formed at lower temperatures (<300 K). The formation of such clusters is not affected by the presence of nickel ions. Whenx is large, the occurrence of long-range ordering seems to depend on the itinerancy of charge carriers.
Volume 42 | Issue 6
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