LXIX. The electrical conductivity of bismuth fibres

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Abstract
In examining the magneto-resistance of thin fibres of bismuth, which are known from previous work to approximate to single crystals, it was found that a considerable proportion of these, about 10 per cent, showed a decrease in the resistance on application of a magnetic field. The effect is only present in fields of the order of 1000 oersteds or less and is of the order of 10−4ρ0. The influence of direction of current, direction of field and orientation of the crystal axes is examined. It is considered that these observations provide the first unequivocal evidence of the existence of a longitudinal Hall coefficient. Used in conjunction with the theory of conduction in anisotropic solids, it is possible to indicate the appropriate crystal orientation. It has not, as yet, been possible to designate this with accuracy.

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