Temperature memory and resistive glassy behaviors of a perovskite manganite

Details Temperature memory and resistive glassy behaviors of a perovskite manganite Temperature memory and resistive glassy behaviors of a perovskite manganite

2008-02-19

arxiv.org/abs/0802.2729v1

Physics

Condensed Matter

Materials Science

Submitted to PRB

Scientific paper

10.1103/PhysRevB.77.214406

This paper reports the observations of long-time relaxation, aging, and temperature memory behaviors of resistance and magnetization in the ferromagnetic state of a polycrystalline La0.7Ca0.3Mn0.925Ti0.075O3 compound. The observed glassy dynamics of the electrical transport appears to be magnetically originated and has a very close association with the magnetic glassiness of the sample. 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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