Negative transverse magnetoresistance of boron-doped graphite at liquid-nitrogen temperature in relation to 3D weak localization

The negative transverse magnetoresistance of boron-doped graphite at liquid-nitrogen temperature has been studied in detail using 3000 degreesC-treated Grafoil (commercially available graphite foil), with the measurements of interlayer spacing do,, at room temperature, the Hall coefficient and electrical resistivity at liquid-nitrogen temperature, and temperature dependence of the resistivity in a temperature range 1.7-273 K. The negative transverse magnetoresistance can be measured for the specimens with hole carriers having the Fermi energy lower than -0.07 eV, estimated by the Slonezewski-Weiss-McCure (SWMcC) band model using the Hall coefficient data. Characteristic feature of the negative transverse magnetoresistance has been investigated in terms of the SWMcC band model and a weak localization theory obtained by extending Kawabata's theory.