The temperature dependence of the resistance of the boron-doped diamond films grown on quartz plotted on a log-log scale. The samples differ from each other in their boron concentration, which increases when going from to . The of and are 1.8 and 2.2 K, respectively.
The log-linear plot of the of samples and . Inset: The vs temperature plot of on a log-log scale. Here, is the sample conductivity. The dashed line corresponds to the linear fit.
The Arrhenius plots of samples and (inset). Good linear fits were obtained in the temperature range between 20 and 1.2 K.
The magnetoresistance of sample for temperatures between (a) 0.4 and 1.4 K and (b) 1.6 and 3 K. NMR stands for negative magnetoresistance.
The magnetoresistance for sample measured between 0.5 and 2.5 K. NMR stands for negative magnetoresistance.
The temperature dependence of the fields at which the crossover happens for sample . The dashed line corresponds to the fit of the values by using a temperature dependence similar to that empirically found for the superconducting critical field.
The data for sample , taken at 0.5 K, plotted as a function of on a semilogarithmic scale.
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