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

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

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

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

Journal Article · Wed Dec 03 00:00:00 EST 2014 · Journal of Physics. Condensed Matter

DOI:https://doi.org/10.1088/0953-8984/27/1/015602· OSTI ID:1302910

Wang, C. H. ^[1]; Poudel, L. ^[2]; Taylor, Alice E. ^[3]; Lawrence, J M. ^[4]; Christianson, Andrew D. ^[2]; Chang, S. ^[5]; Rodriguez-Rivera, J. A. ^[6]; Lynn, J. W. ^[5]; Podlesnyak, Andrey A. ^[3]; Ehlers, G. ^[3]; Baumbach, R. E. ^[7]; Bauer, E. D. ^[8]; Gofryk, Krzysztof ^[9]; Ronning, F. ^[8]; Mcclellan, K. J. ^[8]; Thompson, J. D. ^[8]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); University of California, Irvine, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
University of California, Irvine, CA (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Idaho National Lab. (INL), Idaho Falls, ID (United States)

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 research the spin fluctuations near an antiferromagnetic (AF) quantum critical point (QCP). The resistivity and the specific heat coefficient for T ≤ 1 K 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 log T and the resistivity varies linearly with temperature. In addition, 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. In conclusion, we suggest that these deviations from the divergent behavior expected for a QCP may result from alloy disorder.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; FG02-03ER46036; DMR-0944772

OSTI ID:: 1302910

Journal Information:: Journal of Physics. Condensed Matter, Vol. 27, Issue 1; ISSN 0953-8984

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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