Observation of a minimum in the temperature-dependent electrical resistance above the magnetic-ordering temperature in Gd2PdSi3

Mallik, R. ; Sampathkumaran, E. V. ; Strecker, M. ; Wortmann, G. (1998) Observation of a minimum in the temperature-dependent electrical resistance above the magnetic-ordering temperature in Gd2PdSi3 EPL: Europhysics Letters, 41 (3). pp. 315-320. ISSN 0295-5075

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Official URL: http://iopscience.iop.org/0295-5075/41/3/315

Related URL: http://dx.doi.org/10.1209/epl/i1998-00149-4

Abstract

Results on electrical resistivity, magnetoresistance, magnetic susceptibility, heat capacity and 155Gd Mössbauer measurements on a Gd-based intermetallic compound, Gd2PdSi3, 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.

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