Non-Doniach-type phase diagram of CeNiGe2

A. T. Holmes, T. Muramatsu, D. Kaczorowski, Z. Bukowski, T. Kagayama, and K. Shimizu
Phys. Rev. B 85, 033101 – Published 9 January 2012

Abstract

The heavy-fermion antiferromagnet CeNiGe2 was investigated under pressure by resistivity and ac calorimetry up to 4 GPa and down to 40 mK. The two magnetic transitions found in both resistivity and specific heat at 0.1 GPa at TN1=3.95 and TN2=3.21 K are replaced by a single one at 0.7 GPa and 2.81 K. Increasing pressure initially reduces this further, however, at about 1.7 GPa, a new transition appears, accompanied by a marked change in the pressure dependence of the ordering temperatures, the temperature dependence of the resistivity, and the residual resistivity; the latter indicates a marked change in the quantum fluctuations present. There are signs that this new transition has some first-order character. The phase diagram of CeNiGe2 bears little resemblance to the Doniach phase diagram widely used to classify heavy-fermion compounds.

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  • Received 20 December 2011

DOI:https://doi.org/10.1103/PhysRevB.85.033101

©2012 American Physical Society

Authors & Affiliations

A. T. Holmes1,*, T. Muramatsu1, D. Kaczorowski1,2, Z. Bukowski2, T. Kagayama1, and K. Shimizu1

  • 1Center for Quantum Science and Technology under Extreme Conditions, Osaka University, Toyonaka, Osaka 560-8531, Japan†
  • 2Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, PL-50-950 Wrocław, Poland

  • *a.t.holmes@bham.ac.uk
  • Current address: School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, UK.

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Issue

Vol. 85, Iss. 3 — 15 January 2012

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