Abstract
The magnetization process of FeSi has been measured with a high-quality single-crystalline sample using a SQUID magnetometer in the temperature range from 5 K to 600 K. From the Arrott plots of the magnetization data, the fourth-order coefficient of the free energy is found to have a large positive value at low temperature and significantly decreases by the order of 10 5 with increasing temperature. This result can be explained with a new spin fluctuation theory of FeSi proposed by Takahashi.
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