Electrical transport, heat capacity, and high-field magnetization study in intermetallic Ni2CeSn compound
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Magnetization, heat capacity, and electrical resistivity measurements were performed on a Ni2 CeSn compound (orthorhombic structure) in the temperature range of 2-300 K. This compound is paramagnetic down to 6 K. At higher temperatures above T=150 K, the magnetic susceptibility obeys Curie-Weiss behavior yielding an effective magnetic moment μeff =2.56 μB f.u., which is very close to that of the free Ce3+ ion (2.54 μB) with a high negative Curie-Weiss temperature, CW =-170 K. As the temperature is decreased, the magnetic moment decreases gradually to 0.43 μB f.u. at 4.2 K. We also infer that, based on the high field (up to 23 T) magnetization and the magnetic susceptibility data, a crystal-field splitting of cerium atoms becomes significant at temperatures below 150 K. We used heat capacity and resistivity measurements to determine the crystal-field splitting of the Ce3+ magnetic sublevels. It is found that the ground magnetic state for the Ce3+ is a doublet of Jz =±12 states, with a first excited quartet of Jz =±32 and Jz =±52 states separated by ∼107 K. The resistivity exhibits a shallow minimum at about 11 K, which may be due to the development of partial magnetic order based on these crystal-field-split states. © 2008 American Institute of Physics.
author list (cited authors)
Öner, Y., Goruganti, V., Kamer, O., Guillot, M., & Ross, J. H.