Investigation of Mn, Fe, and Ni incorporation in CeCo2Al8

Larico J. Treadwell, Louisiana State University
Pilanda Watkins-Curry, Louisiana State University
Jacob D. McAlpin, Louisiana State University
Drew J. Rebar, The University of Texas at Dallas
Jessica K. Hebert, The University of Texas at Dallas
John F. Ditusa, The University of Texas at Dallas
Julia Y. Chan, Louisiana State University


Single crystals of CeCo2-xMxAl8 (M = Mn, Fe, Ni; 0 ≤ x < 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 μB/mol Ce and slightly higher than Ce3+ only magnetic moment. The unit cell volumes of Fe-doped compounds also increase with increasing Fe concentration. However, the cell volume of CeCo2-xFexAl8 decreases for x = 1.00 and is not Curie-Weiss possibly because of valence fluctuation.