Abstract
We have successfully grown the single crystals of RMg3 (R = La, Ce and Nd) compounds by Bridgman method, in a sealed molybdenum crucible. These compounds crystallize in the cubic BiF3-type structure with the space group Fm3̄m. The powder x-ray diffraction pattern clearly revealed that the samples were single phase without any impurity. The crystals were oriented by means of Laue back reflection method for the magnetic and transport measurements. It has been found that CeMg3 orders antiferromagnetically at TN = 2.6 K, while NdMg3 shows two magnetic orderings with TN1 = 6.8 K and TN2 = 2.8 K respectively. The magnetic part of the electrical resistivity of CeMg3 exhibited a double peak structure and the magnetization measurement revealed a reduced magnetic moment of 0.5 μB/Ce. The heat capacity measurement of CeMg3 measured down to 0.5 K exhibited an enlarged Sommerfeld coefficient of 370 mJ/K2 mol. From the Schottky heat capacity we have estimated the crystal electric field split energy levels of CeMg3 and NdMg3.
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