Abstract
Magnetic transitions in La(Fe 1− x Co x ) 11.4Si 1.6 compounds with x=0–0.08, have been studied by DC magnetic measurements and Mössbauer spectroscopy. The temperature dependence of the Landau coefficients has been derived by fitting the magnetization, M( μ 0 H), using the Landau expansion of the magnetic free energy. For x⩽0.02 there is a strongly first-order magnetic phase transition between ferromagnetic and paramagnetic (F–P) states in zero external field and a metamagnetic transition from paramagnetic to ferromagnetic (P–F) above T c. Increasing the cobalt content drives the F–P transition towards second order and eliminates the metamagnetic transition.
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