Article ID Journal Published Year Pages File Type
1594998 Solid State Communications 2008 4 Pages PDF
Abstract

In order to investigate the effects of grain boundaries on the electrical properties of La0.50Ca0.50MnO3+δ impedance spectroscopic studies have been carried out at 77 K. With time there is irreversible formation of domains, which promotes the insulating behaviour of this charge ordered material. As time passes, the grain boundary resistance increases, showing the canted spin nature of the material. However, after 150 hours the grain boundary resistance becomes saturated, indicating that most of the metastable states have relaxed and transformed into stable charge ordered ones, most probably of antiferromagnetic nature. An equivalent circuit model, R1(R2C2)(R3C3), i.e., a resistor–capacitor network, has been proposed to explain the impedance results.

Related Topics
Physical Sciences and Engineering Materials Science Materials Science (General)
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