Volume 41, Number 3, february I 1998
|Page(s)||315 - 320|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Observation of a minimum in the temperature-dependent electrical resistance above the magnetic-ordering temperature in
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
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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