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

Published

December 3, 2014

Author(s)

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

Abstract

Inelastic neutron scattering experiments were performed on a single crystal of the heavy Fermion compound Ce(Ni_0.935Pd_0.065)₂Ge₂ in order to study the spin fluctuations near an antiferromagnetic (AF) quantum critical point (QCP). We find that the inverse staggered susceptibility x(Q_N)^{-1 and the inverse correlation lifetime Γ(Q_N) = t}u-1^ vary as T=^3/2, while the resistivity varies as p(T) varies as T^3/2 and the coefficient of specific heat γ(T) varies as γo-aT^{1/2}. 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}(Q_N) are related via T α ξ}u2^. 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.

Citation

Journal of Physics: Condensed Matter

Volume

27

Issue

1

Pub Type

Journals

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Keywords

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

Citation

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_0.065)₂Ge₂, Journal of Physics: Condensed Matter, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=909484 (Accessed April 25, 2024)