Longitudinal Magnetoresistance of Pure Aluminum Wires
- 31 May 1965
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 138 (5A), A1448-A1452
- https://doi.org/10.1103/physrev.138.a1448
Abstract
The longitudinal magnetoresistance has been investigated for aluminum wires having purity sufficient to make boundary scattering observable. Measurements were made at 4.2°K using fields up to 13 kOe. Wire diameters were in the range 0.005-0.05 cm. As expected, the magnetoresistance becomes increasingly negative at smaller diameters. In order to analyze the data, the normal positive magnetoresistance was taken into account by means of a modified Kohler's rule suggested by Olsen. By use of the free-electron theory of Chambers the mean free path , electron momentum , and the product of mean free path by resistivity , were obtained for each wire. The average was found to be 1.0±0.2× . This result was compared with wave numbers expected for central orbits of the approximate second-zone Fermi surface. It was found to correspond most closely to the (111) orbit, consistent with the preferred grain orientation in the wires. The result, interpreted according to the free-electron relation, gives a surface area about that predicted for the second-zone surface.
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