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New Resistance Minimum Phenomenon in Ferromagnetic Alloys

 

作者: D. J. Gillespie,   A. I. Schindler,  

 

期刊: Journal of Applied Physics  (AIP Available online 1970)
卷期: Volume 41, issue 3  

页码: 918-918

 

ISSN:0021-8979

 

年代: 1970

 

DOI:10.1063/1.1659020

 

出版商: AIP

 

数据来源: AIP

 

摘要:

The electrical resistivity of Pt&sngbnd;Ni alloys containing approximately 30, 35, 37, 40, 45, and 50 at.% Ni has been measured between 1.4° and 4.2°K. A clear resistance minimum is found for the two ferromagnetic samples, 45 and 50 at.% Ni, at 3.6° and 2.7°K, respectively. Although no minimum was found for the paramagnetic alloys, there was evidence of a turnup at low temperatures. All of the data could be fitted by the equation &rgr; = &rgr;0+AT2−BInT. Both coefficients,AandB, increase rapidly as the critical concentration for ferromagnetism is approached from both the paramagnetic and ferromagnetic sides. The application of a 20‐kG field to the 50 at.% Ni sample produced no detectable change in the temperature dependence of the resistivity. Ordering of this sample (by annealing at 600°C) yielded a paramagnetic state for which the coefficientAincreased by a factor of three and the InTterm was no longer observed. Although theT2term originates from electron‐electron scattering, the origin of the InTterm is not clear at the present.

 

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