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Title: Quantum critical fluctuations in the heavy fermion compound Ce(Ni0.935 Pd0.065)2Ge2

Electric resistivity, specific heat, magnetic susceptibility, and inelastic neutron scattering experi- ments were performed on a single crystal of the heavy fermion compound Ce(Ni0.935 Pd0.065)2Ge2 in order to study the spin fluctuations near an antiferromagnetic (AF) quantum critical point (QCP). The resistivity and the specific heat coefficient for T ≤ 1 K exhibit the power law behavior expected for a 3D itinerant AF QCP (ρ(T) ~ T3/2 and γ(T) ~ γ0 - bT1/2). However, for 2 ≤ T ≤ 10 K, the susceptibility and specific heat vary as log T and the resistivity varies linearly with temperature. Furthermore, despite the fact that the resistivity and specific heat exhibit the non-Fermi liquid behavior expected at a QCP, the correlation length, correlation time, and staggered susceptibility of the spin fluctuations remain finite at low temperature. We suggest that these deviations from the divergent behavior expected for a QCP may result from alloy disorder.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [2] ;  [5] ;  [6] ;  [5] ;  [3] ;  [3] ;  [7] ;  [8] ;  [9] ;  [8] ;  [8] ;  [8]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of California, Irvine, CA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Univ. of California, Irvine, CA (United States)
  5. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  6. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
  7. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); National High Magnetic Field Lab., Tallahassee, FL (United States)
  8. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  9. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Idaho National Lab. (INL), Idaho Falls, ID (United States)
Publication Date:
OSTI Identifier:
1177660
DOE Contract Number:
DMR-0944772; FG02-03ER46036
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Physics. Condensed Matter; Journal Volume: 27; Journal Issue: 1
Publisher:
IOP Publishing
Research Org:
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; Phase Transformation; SPECIFIC HEAT; FLUCTUATIONS; ELECTRIC CONDUCTIVITY; MAGNETIC SUSCEPTIBILITY; MONOCRYSTALS; SPIN; Temperature Range 0000-0013 K; FERMIONS; INELASTIC SCATTERING; Neutron Scattering; ANTIFERROMAGNETISM; FERMI GAS; Fermi Liquid; ALLOYS CERIUM; STRONG ELECTRONIC CORRELATIONS