Electrical resistance and magnetoresistance of amorphous alloys Gd67Co33 and Pd80Si20 |
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Authors: | J Kästner H-J Schink EF Wassermann |
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Institution: | 2. Physikalisches Institut der RWTH Aachen, D-5100 Aachen, West Germany |
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Abstract: | In search for structural contributions to the low temperature anomaly we report high resolution resistance and magnetoresistance measurements () of amorphous splats of Gd67Co33 and Pd80Si20. For both alloys, the resistivity ?(H = 0, T) has a minimum at T ~ 10 K and increases with decreasing T. The ferromagnetic Gd67Co33 shows a strong negative field dependence of , saturating at H ~ 2T for T = 4.2 K but no measurable change in below 10 K is observed.The diamagnetic Pd80Si20 exhibits a positive field dependent magnetoresistance at low temperatures. Additionally, a field dependent part in is found which is probably due to paramagnetic impurities (~ 1 ppm Fe). However, there is also a field independent contribution in the amorphous state of Pd80Si20, which vanishes after crystallization. We attribute this to non-magnetic scattering induced by the disordered structure. |
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