A zero resistance has been observed in three single crystals of gallium at liquid-helium temperatures for the case of magnetic field parallel to current parallel to a axis, for fields greater than 2 kG. The onset of zero resistance is insensitive to impurity content as measured by the value of the residual resistance ratio, and to temperature in the range 2 to 4.2^∘{}K. The most probable explanation of our results is in terms of magnetic breakdown. Calculation of energy gaps from our data range from 1.4×{}10^-2 eV to 4.7×{}10^-3 eV, dependent on the effective mass used.
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Yahia et al. (1969) studied this question.
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