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. 2012 Oct 11;2:726. doi: 10.1038/srep00726

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Copyright © 2012, Macmillan Publishers Limited. All rights reserved

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(a) Temperature-dependence of longitudinal resistance R_xx. Lower inset shows the Arrhenius plot of R_xx∼, which yields an activation energy of 100 meV in the temperature range of 120-300 K. Upper inset plots the R_xx at temperature lower than 20 K and no apparent saturation was observed. (b) A plot of longitudinal conductance G_xxvs T^−1/4. Solid line (red) is the data fit to the 3D variable range hopping (VRH): G_xx∼; deviation from the fit at low temperature signifies the parallel metallic conduction. (c) Temperature-dependence of the low-field R_H. Inset shows the R_xy curve at 1.9 K. The dominant charge carriers are electrons.

Inline graphic — (a) Temperature-dependence of longitudinal resistance R_xx. Lower inset shows the Arrhenius plot of R_xx∼, which yields an activation energy of 100 meV in the temperature range of 120-300 K. Upper inset plots the R_xx at temperature lower than 20 K and no apparent saturation was observed. (b) A plot of longitudinal conductance G_xxvs T^−1/4. Solid line (red) is the data fit to the 3D variable range hopping (VRH): G_xx∼; deviation from the fit at low temperature signifies the parallel metallic conduction. (c) Temperature-dependence of the low-field R_H. Inset shows the R_xy curve at 1.9 K. The dominant charge carriers are electrons.