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Quantum Critical Fluctuations in the Heavy Fermion compound Ce(Ni^s0.935^Pd0.065)2Ge2



C. H. Wang, L. Poudel, A. E. Taylor, J .M. Lawrence, A. D. Christianson, Sung Chang, Jose Rodriguez Rivera, Jeffrey W. Lynn, A. A. Podlesnyak, G. Ehlers, R. E. Baumbach, E. D. Bauer, K. Gofryk, F. Ronning, K. J. McClellan, J. D. Thompson


Inelastic neutron scattering experiments were performed on a single crystal of the heavy Fermion compound Ce(Ni0.935Pd0.065)2Ge2 in order to study the spin fluctuations near an antiferromagnetic (AF) quantum critical point (QCP). We find that the inverse staggered susceptibility x(QN)-1 and the inverse correlation lifetime Γ(QN) = tu-1^ vary as T=3/2, while the resistivity varies as p(T) varies as T3/2 and the coefficient of specific heat γ(T) varies as γo-aT1/2}. These are the exponents that are predicted for an itinerant AF QCP. Consistent with this, we find that the correlation length ξ α 1/κ and the correlation lifetime Gamma}(QN) are related via T α ξu2^. This demonstrates experimentally one of the central assumptions of the theory of a quantum transition in an itinerant antiferromagnet, namely that the dynamic exponent z is 2.
Journal of Physics: Condensed Matter


Spin Dynamics, heavy fermions, quantum critical point, inelastic neutron scattering


Wang, C. , Poudel, L. , Taylor, A. , Lawrence, J. , Christianson, A. , Chang, S. , Rodriguez Rivera, J. , Lynn, J. , Podlesnyak, A. , Ehlers, G. , Baumbach, R. , Bauer, E. , Gofryk, K. , Ronning, F. , McClellan, K. and Thompson, J. (2014), Quantum Critical Fluctuations in the Heavy Fermion compound Ce(Ni^s0.935^Pd<sub>0.065</sub>)<sub>2</sub>Ge<sub>2</sub>, Journal of Physics: Condensed Matter, [online], (Accessed May 22, 2024)


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Created December 2, 2014, Updated October 12, 2021