Reverse resistance anomaly and negative magnetoresistance of diluteY: Gd andSc: Gd |
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| Authors: | E. Tsang K. Baberschke J. Kästner B. J. Beaudry |
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| Affiliation: | (1) Institut für Atom- und Festkörperphysik, Freie Universität Berlin, Boltzmannstraße 20, D-1000 Berlin, Germany;(2) II. Physikalisches Institut, Technische Hochschule Aachen, D-5100 Aachen, Germany;(3) Ames Laboratory-DOE and Department of Materials Science and Engineering, Iowa State University, 50011 Ames, Iowa, USA |
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| Abstract: | A logarithmical decrease in the resistivity below 10 K has been observed for 200 to 5,000 ppm Gd in Y and Sc. The decrease scales with the Gd concentration. The results are in line with previously published data forLu: Gd and LaAl2: Gd, they are discussed in terms of a ferromagnetic (J>0) Kondoeffect. The scaling parameterTK, and the extracted effective change interactionJeff are compared with other experimental results. In addition the negative magnetoresistance (the freezing out of spin-disorder scattering) has been measured up to 50 kG. Possible interference of potential and exchange scattering may have been observed in the magnetoresistance.Supported by special research fund Sfb 161 of the Deutsche Forschungsgemeinschaft |
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