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Abstract: This paper reports the observations of long-time relaxation, aging, andtemperature memory behaviors of resistance and magnetization in theferromagnetic state of a polycrystalline La0.7Ca0.3Mn0.925Ti0.075O3 compound.The observed glassy dynamics of the electrical transport appears to bemagnetically originated and has a very close association with the magneticglassiness of the sample. Phase separation and strong correlation betweenmagnetic interactions and electronic conduction play the essential roles inproducing such a resistive glassiness. We explain the observed effects in termsof a coexistence of two competing thermomagnetic processes, domain growth andmagnetic freezing, and propose that hole-doped perovskite manganites can beconsidered as -resistive glasses-.



Autor: D. N. H. Nam, N. V. Khien, N. V. Dai, L. V. Hong, N. X. Phuc

Fuente: https://arxiv.org/







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