Abstract
Measurements of the Hall voltage have been made on several specimens of high purity tin at liquid helium temperatures and in magnetic fields up to 4·5 T. The field dependence has been studied for field directions 0 to 51° from the c axis. In the range 0 to 1½°, the behaviour has been explained in terms of the conversion by magnetic breakdown (MB) of electron orbits into a network of coupled hole orbits. The linking by MB of open orbits to form closed hole orbits accounts for the behaviour in the range 16° to 38°. The occurrence of oscillations in the Hall voltage provides further evidence for these interpretations. The breakdown field, B 0 has been found to depend on height, kz, above the central (0.01) plane according to the relation B0=(0.9±0.1)+(4.0±0.3) × 10−18kz 2.

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