Tuning low-temperature physical properties of CeNiGe3 by magnetic field

E. D. Mun, S. L. Bud’ko, A. Kreyssig, and P. C. Canfield
Phys. Rev. B 82, 054424 – Published 18 August 2010

Abstract

We have studied the thermal, magnetic, and electrical properties of the ternary intermetallic system CeNiGe3 by means of specific heat, magnetization, and resistivity measurements. The specific heat data, together with the anisotropic magnetic susceptibility, was analyzed on the basis of the point charge model of crystalline electric field. The J=5/2 multiplet of the Ce3+ is split by the crystalline electric field into three Kramers doublets, where the second and third doublets are separated from the first (ground state) doublet by Δ1100K and Δ2170K, respectively. In zero field CeNiGe3 exhibits an antiferromangeic order below TN=5.0K. For Ha two metamagnetic transitions are clearly evidenced between 24K from the magnetization isotherm and extended down to 0.4 K from the magnetoresistance measurements. For Ha, TN shifts to lower temperature as magnetic field increases, and ultimately disappears at Hc32.5kOe. For H>Hc, the electrical resistivity shows the quadratic temperature dependence (Δρ=AT2). For HHc, an unconventional Tn dependence of Δρ with n>2 emerges, the exponent n becomes larger as magnetic field increases. Although the antiferromagnetic phase transition temperature in CeNiGe3 can be continuously suppressed to zero, it provides an example of field tuning that does not match current simple models of quantum criticality.

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  • Received 21 May 2010

DOI:https://doi.org/10.1103/PhysRevB.82.054424

©2010 American Physical Society

Authors & Affiliations

E. D. Mun, S. L. Bud’ko, A. Kreyssig, and P. C. Canfield

  • Ames Laboratory US DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

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Issue

Vol. 82, Iss. 5 — 1 August 2010

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