Abstract
Electrical conductivity and Hall effect are measured on p-type Ag-doped CdCr2Se4 single crystals. The carrier concentration has a minimum at temperatures from 140–150 K and then increases as the temperature decreases. This increase in carrier concentration can be interpreted as the onset of conduction in the narrow d band of Cr3+ ions in addition to that in the valence band. The variation of the carrier mobility with temperature can be expressed as µ∝T-S at temperature above 185 K. According to the value of S, the samples are classified into two groups, one with S=1.59 and 1.16, and the other with S=0.25–0.61. It seems that in the former group, the scattering by acoustic phonon is predominant, while in the latter group, the spin-dependent one or the neutral-impurity one is effective, accompanied by phonon scattering.
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