ISSN:
1434-6036
Keywords:
72.10.-d
;
72.15.Cz
;
72.15.Gd
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract We present high resolution measurements of low-temperature resistance and magnetoresistance (Δ ϱ/ϱ: ±5·10−8) on two 3D amorphous Ca1−x Al x -alloys (x=0.25 and 0.4). On the basis of such extreme data accuracy, and using theories of quantum corrections (WL and EEI), in conjunction with an elaborate fitting procedure, we show that for these metallic glasses a fully consistent description of the experimental data in terms of given theory is possible only in the limits of low fields and low temperatures. We quantitatively identify the deviations occurring at higher fields as being due to contributions from the ‘classical’ magnetoresistance (∼B 2), and those occurring at higher temperatures as caused by Ziman-Faber diffraction in metallic glasses (∼T 2). Accounting for this,a complete set of solid state parameters is then reliably accessible. In addition to relevant scattering ratesτ Φ −1 andτ SO −1 , these are: resistivity ϱ, diffusivityD, Sommerfeld coefficient γ, Fermi-wavevectork F , electronphonon coupling constant λ, and EEI constants μ=F/2 andμ *. Particularly, what concerns the parameterF, which describes the effective electron-electron-interaction, and determines whether the material is superconducting or not, an inconsistency in the experimental literature is resolved. We show that, due to the influence of the ‘classical’ contribution to magnetoresistance,F can only be obtained from the temperature dependence of resistivity.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01320509
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