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

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

doi:10.1088/0953-8984/27/1/015602

Quantum critical fluctuations in the heavy fermion compound Ce(Ni_0.935Pd_0.065)₂Ge₂

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

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

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_0.935Pd_0.065)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 ≤ 1K exhibit the power law behavior expected for a 3D itinerant AF QCP (ρ(T) ∼ T^3/2 and γ(T) ∼ γ₀- bT^1/2). 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.

Original language	English
Article number	015602
Journal	Journal of Physics Condensed Matter
Volume	27
Issue number	1
DOIs	https://doi.org/10.1088/0953-8984/27/1/015602
State	Published - Jan 14 2015

Funding

Funders	Funder number
National Science Foundation	DMR-0944772
U.S. Department of Energy
National Science Foundation
Directorate for Mathematical and Physical Sciences	0944772

Keywords

Antiferromagnetic quantum critical point
Correlation length
Correlation time
Heavy fermion
Kondo disorder
Non-Fermi liquid

Access to Document

10.1088/0953-8984/27/1/015602

Cite this

Wang, C. H., Poudel, L., Taylor, A. E., Lawrence, J. M., Christianson, A. D., Chang, S., Rodriguez-Rivera, J. A., Lynn, J. W., Podlesnyak, A. A., Ehlers, G., Baumbach, R. E., Bauer, E. D., Gofryk, K., Ronning, F., McClellan, K. J., & Thompson, J. D. (2015). Quantum critical fluctuations in the heavy fermion compound Ce(Ni_0.935Pd_0.065)₂Ge₂. Journal of Physics Condensed Matter, 27(1), Article 015602. https://doi.org/10.1088/0953-8984/27/1/015602

@article{f0bbe7d1676f42779ccf0b1d46c88f92,

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

abstract = "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)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 ≤ 1K 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 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.",

keywords = "Antiferromagnetic quantum critical point, Correlation length, Correlation time, Heavy fermion, Kondo disorder, Non-Fermi liquid",

author = "Wang, {C. H.} and L. Poudel and Taylor, {A. E.} and Lawrence, {J. M.} and Christianson, {A. D.} and S. Chang and Rodriguez-Rivera, {J. A.} and Lynn, {J. W.} and Podlesnyak, {A. A.} and G. Ehlers and Baumbach, {R. E.} and Bauer, {E. D.} and K. Gofryk and F. Ronning and McClellan, {K. J.} and Thompson, {J. D.}",

note = "Publisher Copyright: {\textcopyright} 2015 IOP Publishing Ltd.",

year = "2015",

month = jan,

day = "14",

doi = "10.1088/0953-8984/27/1/015602",

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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 2015, 'Quantum critical fluctuations in the heavy fermion compound Ce(Ni_0.935Pd_0.065)₂Ge₂', Journal of Physics Condensed Matter, vol. 27, no. 1, 015602. https://doi.org/10.1088/0953-8984/27/1/015602

TY - JOUR

T1 - Quantum critical fluctuations in the heavy fermion compound Ce(Ni0.935Pd0.065)2Ge2

AU - Wang, C. H.

AU - Poudel, L.

AU - Taylor, A. E.

AU - Lawrence, J. M.

AU - Christianson, A. D.

AU - Chang, S.

AU - Rodriguez-Rivera, J. A.

AU - Lynn, J. W.

AU - Podlesnyak, A. A.

AU - Ehlers, G.

AU - Baumbach, R. E.

AU - Bauer, E. D.

AU - Gofryk, K.

AU - Ronning, F.

AU - McClellan, K. J.

AU - Thompson, J. D.

PY - 2015/1/14

Y1 - 2015/1/14

N2 - 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)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 ≤ 1K 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 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.

AB - 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)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 ≤ 1K 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 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.

KW - Antiferromagnetic quantum critical point

KW - Correlation length

KW - Correlation time

KW - Heavy fermion

KW - Kondo disorder

KW - Non-Fermi liquid

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