Magnetic and electrical properties of reentrant Ce(Fe1−xAlx)2

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Abstract
The intermetallic compound CeFe2 undergoes a transition from paramagnetic to ferromagnetic ordering at the Curie temperature Tc = 227 K. Upon substitution of Al at the Fe sites, the system Ce(Fe1−xAlx)2 undergoes a reentrant transition at Tf < Tc, below which the ferromagnetic structure is destroyed. As Al concentration is increased, Tf is raised and Tc is lowered, reducing the temperature range of ferromagnetic order. Results are presented for resistivity, ac susceptibility, magnetization, and thermal-expansion experiments for x≤0.15 in the temperature range 4–290 K. At Tf there is a dramatic drop in ac susceptibility and magnetization as well as a local minimum in the resistivity. This local minimum, and subsequent rise to a peak in resistivity can be explained in terms of spin-glass freezing. Thermal-expansion experiments indicate that the low-temperature transition is not of the first order.

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