Resistivity and Hall effect in Y9Co7

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Abstract
The temperature dependence of the resistivity and Hall effect of Y9Co7 has been measured from room temperature to 1.6 K. The saturation of the resistivity at high temperature is similar to that of A15 compounds and can be interpreted in terms of a localised phonon mode formation as shown by Yu and Anderson (1984) for A15 compounds. A T2-dependence of the resistivity is observed for temperatures below approximately=25 K. A similar T2-dependence at low temperatures is always observed in A15 compounds as well and is not fully understood. However, a T2-dependence below 10 K does not seem to be due to itinerant ferromagnetism in Y9Co7 as concluded recently by Kolodziejczyk and Spalek (1984). The observation of a peak at approximately=25 K in the Hall coefficient suggests a spin glass type of freezing at low temperatures which possibly can account for the T2-dependence of the resistivity below approximately=10 K.

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