Studies of negative TCR and electronic structure of nonmagnetic metallic glasses based on Y and La

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Abstract
The temperature dependence of the electrical resistivity has been measured over a wide temperature range, 2-300 K, for a number of Y- and L-based metallic glasses. Low-temperature specific heats have also been measured to determine the density of states at the Fermi level and the Debye temperature. All of the resistivity data in the range from about 40 to 300 K can be well described in terms of the equation rho / rho 0=A+B exp(-T/ Delta ). According to Mizutani's classification of metallic glasses, the present alloy systems are to be classified in group (4), together with systems such as Cu-Zr and Cu-Ti. The authors revealed that: (i) the above equation is valid for all group (4) metallic glasses studied so far; (ii) the characteristic temperature Delta increases with increasing Debye temperature theta D; and (iii) the resistivity increases with decreasing density of d states at the Fermi level. Using the generalised Faber-Ziman theory; it is difficult to interpret all these findings in a consistent manner. It is suggested that the d electrons at the Fermi level play a key role in the electron transport in group (4) metallic glasses.

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