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• W2052802042 abstract "Impedance spectroscopy is used to evaluate the contributions of grain and grain boundary resistance to conduction process and magnetoresistance (MR) in CrO2–TiO2 granular composites. It is found that there is a transition from two semicircles to a single semicircle in the Nyquist plot with increasing CrO2 concentration. The resistivities of grain and grain boundary reveal very similar percolation processes, but their critical behaviors display slight differences in the conductance critical exponent. The fittings to experimental data indicate the critical exponents tgb=2.42±0.15, and tg=1.65±0.23, for grain boundaries and grains, respectively. The ratio γg=ρg/ρgb depends strongly on CrO2 concentration. In particular, in the conductance percolation region, we find that the ratio γg exhibits a switch point from γg<1 to γg>1, which may have a great influence on MR. The maximum of MR at 77 K appears close to percolation threshold xc, and reaches −9.1% at 6 kOe, which is attributed to the cluster microstructure and the ratio γg of the composite. As a result, the effective grain boundaries play an important role in manipulating MR in the CrO2 composite." @default.
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• W2052802042 date "2003-12-01" @default.
• W2052802042 modified "2023-09-26" @default.
• W2052802042 title "Role of grain boundaries on magnetoresistance of CrO2–TiO2 composites: impedance spectroscopy study" @default.
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• W2052802042 doi "https://doi.org/10.1016/s0304-8853(03)00347-0" @default.
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