Abstract
The temperature dependences of the electrical resistivity ρ(T) and the ac magnetic susceptibility χ(T, H = 0) are thoroughly investigated for a perovskite-like lanthanum manganite, namely, La0.85Sr0.15MnO3, which is preliminarily exposed to neutron irradiation with a fluence F = 2 × 1019 cm−2 and then annealed at different temperatures ranging from 200 to 1000°C. The results of the electrical resistance measurements demonstrate that neutron irradiation of the samples leads to the disappearance of the low-temperature insulating phase. As the annealing temperature increases, the insulating phase is not restored and the manganite undergoes a transformation into a metallic phase. Analysis of the magnetic properties shows that, under irradiation, the ferromagnet-paramagnet phase transition temperature TC decreases and the magnetic susceptibility is reduced significantly. With an increase in the annealing temperature, the phase transition temperature TC and magnetic susceptibility χ(T, H = 0) increase and gradually approach values close to those for an unirradiated sample. This striking difference in the behavior of the electrical and magnetic properties of the radiation-disordered La0.85Sr0.15MnO3 manganite is explained qualitatively.
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