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Open Access Publications from the University of California

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

  • Author(s): Wang, CH
  • Poudel, L
  • Taylor, AE
  • Lawrence, JM
  • Christianson, AD
  • Chang, S
  • Rodriguez-Rivera, JA
  • Lynn, JW
  • Podlesnyak, AA
  • Ehlers, G
  • Baumbach, RE
  • Bauer, ED
  • Gofryk, K
  • Ronning, F
  • McClellan, KJ
  • Thompson, JD
  • et al.

© 2015 IOP Publishing Ltd. Electric resistivity, specific heat, magnetic susceptibility, and inelastic neutron scattering experiments were performed on a single crystal of the heavy fermion compound Ce(Ni0.935Pd0.065)2Ge2in order to study the spin fluctuations near an antiferromagnetic (AF) quantum critical point (QCP). The resistivity and the specific heat coefficient for T ≤ 1K exhibit the power law behavior expected for a 3D itinerant AF QCP (ρ(T) ∼ T3/2and γ(T) ∼ γ0- bT1/2). However, for 2 ≤ T ≤ 10 K, the susceptibility and specific heat vary as logT 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.

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