Quantum Critical Fluctuations in the Heavy fermion compound Ce(Ni${}_{0.935}$Pd${}_{0.065}$)${}_2$Ge${}_2$

Abstract

Electric resistivity, specific heat, magnetic susceptibility, and inelastic neutron scattering experiments were performed on a single crystal of the heavy fermion compound Ce(Ni${}_{0.935}$Pd${}_{0.065}$)${}_2$Ge${}_2$ in order to study the spin fluctuations near an antiferromagnetic (AF) quantum critical point (QCP). The resistivity and the specific heat coefficient for $T\le$ 1 K exhibit the power law behavior expected for a 3D itinerant AF QCP ($\rho (T)\sim T^{3/2}$ and $\gamma (T)\sim {\gamma }_0-b{T}^{1/2}$). However, for 2 $\le T\le$ 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.

arXiv comment6 pages, 8 figures, To bu published on J. Phys.: Condens. Matter

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