Affordable Access

deepdyve-link
Publisher Website

Evolution of quantum criticality in CeNi(9-x)Cu(x)Ge(4).

Authors
  • Peyker, L
  • Gold, C
  • Scheidt, E-W
  • Scherer, W
  • Donath, J G
  • Gegenwart, P
  • Mayr, F
  • Unruh, T
  • Eyert, V
  • Bauer, E
  • Michor, H
Type
Published Article
Journal
Journal of physics. Condensed matter : an Institute of Physics journal
Publication Date
Jun 10, 2009
Volume
21
Issue
23
Pages
235604–235604
Identifiers
DOI: 10.1088/0953-8984/21/23/235604
PMID: 21825591
Source
Medline
License
Unknown

Abstract

Crystal structure, specific heat, thermal expansion, magnetic susceptibility and electrical resistivity studies of the heavy fermion system CeNi(9-x)Cu(x)Ge(4) (0≤x≤1) reveal a continuous tuning of the ground state by Ni/Cu substitution from an effectively fourfold-degenerate non-magnetic Kondo ground state of CeNi(9)Ge(4) (with pronounced non-Fermi-liquid features) towards a magnetically ordered, effectively twofold-degenerate ground state in CeNi(8)CuGe(4) with T(N) = 175 ± 5 mK. Quantum critical behavior, [Formula: see text], is observed for [Formula: see text]. Hitherto, CeNi(9-x)Cu(x)Ge(4) represents the first system where a substitution-driven quantum phase transition is connected not only with changes of the relative strength of the Kondo effect and RKKY interaction, but also with a reduction of the effective crystal field ground state degeneracy.

Report this publication

Statistics

Seen <100 times