THERMOELECTRIC EFFECTS IN MESOSCOPIC AUFE SPIN-GLASS WIRES

Citation
G. Neuttiens et al., THERMOELECTRIC EFFECTS IN MESOSCOPIC AUFE SPIN-GLASS WIRES, Europhysics letters, 42(2), 1998, pp. 185-190
Citations number
18
Categorie Soggetti
Physics
Journal title
ISSN journal
02955075
Volume
42
Issue
2
Year of publication
1998
Pages
185 - 190
Database
ISI
SICI code
0295-5075(1998)42:2<185:TEIMAS>2.0.ZU;2-8
Abstract
Recently we reported on the differential resistance R(I) = dV/dI of na rrow AuFe spin-glass wires (Phys. Rev. Let., 77 (1996) 2276). Surprisi ngly, R(I) nas found to be asymmetric in I for the smallest samples. I n this letter we present differential resistance measurements performe d on a AuFe wire with a multiprobe geometry. The new experiments revea l that the asymmetric behavior of R(I) can be explained in terms of a mesoscopic thermoelectric effect. Our experiments also indicate that t he thermopower S of a AuFe spin-glass alloy becomes size dependent for length scales below a few hundred nanometers.