Investigation
of Mn, Fe, and Ni Incorporation in CeCo<sub>2</sub>Al<sub>8</sub>
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Abstract
Single crystals of CeCo<sub>2–<i>x</i></sub>M<sub><i>x</i></sub>Al<sub>8</sub> (M =
Mn, Fe, Ni; 0 ≤ <i>x</i> < 1) were grown and characterized
by X-ray diffraction and magnetic susceptibility. The unit cell volumes
of Mn-doped compounds increase and those of Ni-doped compounds decrease
with increasing dopant concentration. All samples display a magnetic
ordering near 6 K with magnetic moments of the analogues ranging from
2.61 to 2.81 μ<sub>B</sub>/mol Ce and slightly higher than Ce<sup>3+</sup> only magnetic moment. The unit cell volumes of Fe-doped
compounds also increase with increasing Fe concentration. However,
the cell volume of CeCo<sub>2–<i>x</i></sub>Fe<sub><i>x</i></sub>Al<sub>8</sub> decreases for <i>x</i> = 1.00 and is not Curie–Weiss possibly because of valence
fluctuation
