Abstract
The temperature and magnetic-field dependences of the electrical resistivity of the system Co2Ga2-xFex (0<or=x<or=1) are presented. A strong magnetic contribution to the resistivity is observed when x is above 0.08, establishing the onset of ferromagnetic order. The paramagnetic alloys in the series with 0<or=x<or=0.07 exhibit high resistivities ( approximately 200 mu Omega cm), and a negative temperature coefficient that can be well explained by including a temperature dependent Debye-Waller factor in the standard expression for resistivity. An exponential departure from the model is observed at low temperatures. This is interpreted as evidence for the existence of localised conduction states in Co(Ga,Fe) at low temperatures. It is proposed that such a localisation arises from a low value of the density of states at the Fermi energy.
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