Magnetic Structures of CeZn2 and TbZn2

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Abstract
CeZn2 and TbZn2 have the orthorhombic CeCu2-type crystal structure. CeZn2 becomes a simple antiferromagnet below the Néel temperature of 7.5°K. The magnetic unit cell is of the same size as the chemical cell. All moments are aligned along the b axis and the saturation moment per Ce at 4.2°K is 1.6± 0.2 μB. In the range 60–75°K, TbZn2 exhibits a linear-transverse-wave moment alignment propagating along the c axis and polarized along the b axis direction. The wavelength of this static magnetization varies from 2.28 to 2.54 in units of c in this temperature range. The moment amplitude per Tb at 62.4°K is 6.91± 0.17 μB. At below 60°K, a first-order magnetic transition takes place and the resulting antiferromagnetic structure has a magnetic unit cell twice the size of the chemical cell, the c axis being doubled. All moments are aligned along the b axis and the saturation moment per Tb at 4.2°K is 8.15± 0.10 μB. The magnetic structures of both CeZn2 and TbZn2 can be described as resulting from the stacking of ferromagnetic sheets of the rare-earth ions in some antiferromagnetic fashion.

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