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The galvanomagnetic properties of niobium and tantalum were measured at 4. 2^ in fields up to 100 kG for single crystals having residual resistivity ratios of 1500 (niobium) and 10 000 (tantalum). The two metals exhibit very similar anisotropy of their galvanomagnetic properties. Each is uncompensated, with a net number of carriers equal to one hole per atom. The strong anisotropy of the magnetoresistance results from open orbits on a surface which is topologically similar to a set of intersecting cylinders along the cube axes. Measurements of the Hall coefficient with the field along the symmetry axes show this to be an open hole surface, and provide a measure of two of its dimensions. This surface is consistent with that proposed by Mattheiss for the group-VB metals on the basis of his energy-band calculations for tungsten.
Fawcett et al. (Sat,) studied this question.