Volume 42, Number 2, April II 1998
|Page(s)||185 - 190|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Thermoelectric effects in mesoscopic AuFe spin-glass wires
Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke
Universiteit Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
2 Department of Physics and Astronomy, Northwestern University 2145 Sheridan Road, Evanston, Illinois 60208, USA
3 Institute for Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
4 Instituut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven Celestijnenlaan 200D, B-3001 Leuven, Belgium
Accepted: 11 March 1998
Recently we reported on the differential resistance 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.
PACS: 72.15.Jf – Thermoelectric and thermomagnetic effects / 73.23.-b – Mesoscopic systems / 75.50.Lk – Spin glasses and other random magnets
© EDP Sciences, 1998
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