Transport and magnetic properties of NdCuGe compound

V. Goruganti, K. D.D. Rathnayaka, Joseph H. Ross, Y. Öner, C. S. Lue, Y. K. Kuo

研究成果: Article同行評審

10 引文 斯高帕斯(Scopus)

摘要

Electrical resistivity, heat capacity, and dc magnetization measurements were performed on the Al B2 -type intermetallics NdCuGe and LaCuGe over the temperature range of 2-300 K. NdCuGe exhibits magnetization attributable to Nd3+ moments, with an antiferromagnetic (AF) transition at 3.1 K. Magnetization, heat capacity, and resistivity measurements were used to determine the crystalline electric field (CEF) splitting of the Nd3+ magnetic sublevels. The ground state is a doublet composed of ±52 levels and the AF state is built from this magnetic doublet, with a reduction in the average sublattice magnetization attributable to site disorder among Cu-Ge sites. Low-temperature electrical transport is dominated by spin-disorder scattering among CEF-split levels and a small T2 spin fluctuation term. The latter is nearly two orders of magnitude smaller than previously observed in isostructural CeCuGe, for which the anomalous observed thermopower exponent was attributed to extended spin fluctuations above the magnetic transition. By contrast, simple-metallic behavior provides a good fit to the NdCuGe thermopower, thus, the CeCuGe results can be attributed to resonant scattering due to partial hybridization of the localized orbitals.

原文English
文章編號073919
期刊Journal of Applied Physics
103
發行號7
DOIs
出版狀態Published - 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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