Abstract

The low-field Hall coefficients R 0 H were measured in Mg Yb alloys at 1.6 and 4.2 K in an applied field up to 25 kG. It is found that (i) magnetic breakdown effect, which causes a change of the sign of the low-field Hall resistivity, can also occur in polycrystalline samples, and (ii) the Hall coefficients show a weak field and temperature dependence. The weak field and temperature dependence can be understood by the progressive smearing of the Kondo resonance by the magnetic field and the temperature.

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