The effect of trivalent ion composition (x) on the transport properties and magnetoresistance (MR) behavior of LaxNd0.6−xSr0.40MnO3−δ films (0.15≤x≤0.45) grown on Si(100) substrates by pulsed laser deposition is reported. It is found that the temperature associated with the peak resistivity can be shifted to higher values by varying the trivalent ion composition, in a similar way to that earlier observed in divalent substituted La1−xMxMnO3−δ (M=Ba, Sr, Ca, Pb) films. MR values near room temperature under a magnetic field of 4.7 T increase with lanthanum ion composition, and the largest MR value of around 30% (Δρ/ρH) appeared in films with x=0.45. Our results suggest that these effects are primarily related to an increase of the Curie temperature of the films as a result of lattice expansion by partial substitution of neodymium with lanthanum, which has a larger ionic radius.
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Zhang et al. (1996) studied this question.
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