Abstract
Electrical and magnetic properties of YbSi 2 have been investigated experimentally by electrical resistivity and a.c. susceptibility measurements. The resistivity data may be summarized as following: 1. (i) at high temperatures the resistivity shows a tendency to saturate; 2. (ii) there is a negative curvature above T ≅ 65 K ( d 2ρ dT 2 < 0) and ρ exhibits an inflection point at 65 K; 3. (iii) below 37 K the resistivity shows a T 2 dependence. The a.c. susceptibility shows a broad peak at about 90 K. The low temperature T 2 resistivity and the broad peak in a.c. susceptibility suggest that YbSi 2 is a valence fluctuating system. The results will be discussed in terms of valence fluctuating phenomena. Measurements of the magnetic moment in YbSi 2 will be carried out in a SQUID magnetometer.
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