Hall mobility of positive carriers in the semimetallic compound LiAl

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Abstract
The temperature-dependent Hall coefficient and electrical resistivity above 77 K of the semimetallic compound LiAl are presented. A "positive" Hall-coefficient anomaly relating to an abrupt change in the resistivity at 95 K was observed near the Li-deficient phase boundary. It is proposed that an abrupt increase in hole concentration at the critical temperature is associated with the slight lowering effect of the Fermi energy (or the increasing effect of the Fermi level for holes) induced by the long-range ordering of Li vacancies at a lower temperature. In addition, the holes near the Li-deficient phase boundary are dominated by the lattice-phonon scattering.