Recently we reported on the differential resistance R ( I ) = d V / dI of narrow AuFe spin-glass wires ( Phys. Rev. Let. , 77 (1996) 2276). Surprisingly, R ( I ) was found to be asymmetric in I for the smallest samples. In this letter we present differential resistance measurements performed on a AuFe wire with a multiprobe geometry. The new experiments reveal that the asymmetric behavior of R ( I ) can be explained in terms of a mesoscopic thermoelectric effect. Our experiments also indicate that the thermopower S of a AuFe spin-glass alloy becomes size dependent for length scales below a few hundred nanometers.
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Neuttiens et al. (1998) studied this question.
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