Abstract
In this paper we report the observations of long-time relaxation, aging, and temperature memory behaviors of resistance and magnetization in the ferromagnetic state of the polycrystalline ${\text{La}}_{0.7}{\text{Ca}}_{0.3}{\text{Mn}}_{0.925}{\text{Ti}}_{0.075}{\text{O}}_{3}$ compound. The observed glassy dynamics of the electrical transport appears to have a magnetic origin and has a very close association with the magnetic glassiness of the sample. The phase separation and strong correlation between magnetic interactions and electronic conduction play the essential roles in producing such a resistive glassiness. We explain the observed effects in terms of a coexistence of two competing thermomagnetic processes, domain growth and magnetic freezing, and propose that hole-doped perovskite manganites can be considered as resistive glasses.
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