Electrical Conduction in CoFe_<2-x>Ti_xO_4 and Co_<1-x>Fe_<2+x>O_4 Single Crystals

概要

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The a.c. resistivity in the range of 100Hz to 100MHz and thermoelectric power were measured for CoFe_<2-x>Ti_xO_4 and Co_<1-x>Fe_<2+x>O_4 single crystals (x=0.06, 0.10. and 0.14) in the temperature range between 78 and 300K. Electrical properties are quite similar for both systems. The concentration of electron carriers increases exponentially with increasing temperature. Its activation energy decreases with increasing ferrous ion contents (x). The mobility takes the value of 2×10^<-2>cm^2/V.sec at 300K and decreases with decreasing temperature. Its activation energy is about 0.05eV and dose not depend on x. The electrical conduction for both systems is satisfactorily explained in terms of the small-polaron hopping model.
社団法人日本物理学会の論文
1973-07-05