| Issue |
Europhys. Lett.
Volume 41, Number 3, february I 1998
|
|
|---|---|---|
| Page(s) | 315 - 320 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1998-00149-4 | |
| Published online | 01 September 2002 | |
Observation of a minimum in the temperature-dependent electrical
resistance above the magnetic-ordering temperature in 
1
Tata Institute of Fundamental Research, Homi Bhabha
Road, Colaba, Mumbai-400 005, India
2
Fachbereich 6-Physik, Universität Paderborn, D-33095, Germany
Corresponding author: SAMPATH@tifrvax.tifr.res.in
Received:
30
June
1997
Accepted:
4
December
1997
Results on electrical resistivity, magnetoresistance, magnetic
susceptibility, heat capacity and 
Mössbauer measurements on
a Gd-based intermetallic compound, 
, are reported. A
finding of interest is that the resistivity unexpectedly shows a
well-defined minimum at about 45 K, well above the long-range magnetic-ordering temperature (21 K), a
feature which gets suppressed by the application of a magnetic field. This observation in a Gd alloy presents
an interesting scenario. On the basis of our results, we propose electron
localization induced by s-f (or d-f) exchange interaction prior to long-range magnetic order as a
mechanism for the electrical resistance minimum.
PACS: 72.15.-v – Electronic conduction in metals and alloys / 75.20.Hr – Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions / 75.30.Et – Exchange and superexchange interactions
© EDP Sciences, 1998
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