Thermopower of Ca1−xAlx metallic glasses

Low-temperature kinetic properties of the amorphous alloy (0.2 <x< 0.8)

“…Based on the fact that the above-described anomalies of ρ(T ), S(T ) and k(T ) are characteristics of many non-magnetic metallic amorphous alloys [1][2][3][4][5][6][7][8][9][10], and on our results confirmed experimentally for Ca x Al 1−x and Au x Ni 1−x [23,24], one may nevertheless conclude that the low-temperature anomalies of electron transport properties are due to pure structure effects and, evidently, connected with interference of inelastic EEI and multiple elastic electron scattering on the DCEs. This effect proves to be very significant in the range of temperature T < 10T 0 , where T 0 is the characteristic temperature of the amorphous alloy which determines the range of the intensive electron scattering on the DCEs [16][17][18][19].…”

“…The electrical resistivity, thermopower and heat conductivity are shown to be characterized at low temperature by 'glassy' anomalies susceptible to change of alloy component concentration. The calculated thermopower and electrical resistivity are in good agreement with experimental data for Ca x Al 1−x [23,10,14,15]. Unfortunately, experimental data for the heat conductivity in this alloy are not known to the present authors, which is why the question of how adequate its description is in the framework of the developed model of the DCEs is still open.…”

“…Hence the temperature T knee will behave in the same way. These results of the calculation of S(T ) in the amorphous alloy Ca x Al 1−x have been discussed in detail in our previous works [18,20,21] which is why we shall not dwell on this question here and note only that they agree well with the experimental data [23] and describe exactly the observed changes in low-temperature behaviour of thermopower connected with the variation of alloy component concentration.…”

“…This conclusion is substantiated by the results of [20]- [22] where the numerical calculations of S(T ) in amorphous Ca x Al 1−x (0.55 x 0.80) and Au x Ni 1−x (0.15 x 0.80) [20,21], and also the calculations of ρ(T ), S(T ) and k(T ) in Au x Ni 1−x (0.60 x 0.70) [22] have been carried out. The comparison of the results for S(T ) in Ca x Al 1−x and for ρ(T ) in Au x Ni 1−x with the existing experimental data [23,24] shows good qualitative and quantitative agreement.…”