Magnetoresistance of Graphite: Deviation from the <I>H</I><SUP>2</SUP> Law and Evaluation of Conduction Parameters
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概要
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The magnetoresistance (Δρ/ρ<SUB>0</SUB>) of graphite is discussed into details with an emphasis on the magnetic field dependence systematically deviating from the so-called quadratic law. A two-band theory developed on the basis of the ellipsoidal approximation for the Fermi surfaces has yielded a success in the formulation ofΔρ/ρ<SUB>0</SUB> as a function not only of the field intensity (<I>H</I>) but of its azimuth with respect to the c-axis; which reveals that the deviation is an intrinsic nature of the majority carrier system of graphite, rather than a result of the presence of the low-mobility minority carriers. Therefore, the conduction parameters (carrier density and mobility) have to be consistently determined with such a non-quadratic <I>H</I>-dependence ofΔρ/ρ<SUB>0</SUB>; appropriate methods for the evaluation are described in connection with the foregoing two-band theory, McClure's conductivity tensor analysis and modified Kohler's rule respectively.
- 炭素材料学会の論文
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