Magnetocrystalline Anisotropy in a Single Crystal of CeNiGe2
M. H. Jung, N. Harrison, A. H. Lacerda, P. G. Pagliuso, J. L. Sarrao, J. D. Thompson
Abstract
We report measurements on single crystals of orthorhombic CeNiGe2, which is found to exhibit highly anisotropic magnetic and transport properties. The magnetization ratio M(H//b)/M(Hb) at 2 K is observed to be about 18 at 4 T and the electrical resistivity ratio r//b/rb is about 70 at room temperature. It is confirmed that CeNiGe2 undergoes two-step antiferromagnetic transition at 4 and 3 K, as reported for polycrystalline samples. The application of magnetic field along the b axis (the easy magnetization axis) stabilizes a ferromagnetic correlation between the Ce ions and enhances the hopping of carriers. This results in large negative magnetoresistance along the b axis.
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