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Transport and magnetic properties of NdCuGe compound

J. Appl. Phys. 103, 073919 (2008); doi:10.1063/1.2904856

Published 11 April 2008

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V. Goruganti,1 K. D. D. Rathnayaka,1 Joseph H. Ross, Jr.,1 Y. Öner,2 C. S. Lue,3 and Y. K. Kuo4
1Department of Physics, Texas A&M University, College Station, Texas 77843-4242, USA
2Department of Physics, Faculty of Sciences and Letters, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey
3Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan
4Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan
Electrical resistivity, heat capacity, and dc magnetization measurements were performed on the AlB2-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 ±5/2 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. ©2008 American Institute of Physics
History: Received 22 December 2007; accepted 6 February 2008; published 11 April 2008
Permalink: http://link.aip.org/link/?JAPIAU/103/073919/1
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KEYWORDS and PACS

Keywords
PACS
  • 75.40.Cx
    Static properties of magnetic materials
  • 75.60.Ej
    Magnetization curves, hysteresis, Barkhausen and related effects
  • 75.30.Kz
    Magnetic phase boundaries
  • 72.15.Eb
    Electrical and thermal conduction in crystalline metals and alloys
  • 75.30.Ds
    Spin waves in magnetically ordered materials
  • YEAR: 2008

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PUBLICATION DATA

ISSN:
0021-8979 (print)   1089-7550 (online)
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