Momentum-space structure of quasielastic spin fluctuations in Ce3Pd20Si6

Portnichenko, P. Y.; Cameron, A. S.; Surmach, M. A.; Deen, Pascale P.; Paschen, S.; Prokofiev, A.; Mignot, Jean-Michel; Strydom, A. M.; Telling, Mark T. F.; Podlesnyak, Andrey A.; Inosov, D. S.

doi:10.1103/PhysRevB.91.094412

Title: Momentum-space structure of quasielastic spin fluctuations in Ce₃Pd₂₀Si₆

Journal Article · Fri Mar 13 00:00:00 EDT 2015 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.91.094412· OSTI ID:1265377

Portnichenko, P. Y. ^[1]; Cameron, A. S. ^[1]; Surmach, M. A. ^[1]; Deen, Pascale P. ^[2]; Paschen, S. ^[3]; Prokofiev, A. ^[3]; Mignot, Jean-Michel ^[4]; Strydom, A. M. ^[5]; Telling, Mark T. F. ^[6]; Podlesnyak, Andrey A. ^[7]; Inosov, D. S. ^[1]

Institut fur Festkorperphysik, Dresden, (Germany)
European Spallation Source ESS AB, Lund (Sweden); Niels Bohr Institutet, University of Copenhagen, (Denmark)
Institute of Solid State Physics, Vienna University of Technology, Vienna (Austria)
Laboratoire LÂ´eon Brillouin, Gif sur Yvette (France)
Department of Physics, University of Johannesburg, (South Africa)
ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot (United Kingdon); Department of Materials, University of Oxford, (United Kingdom)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Surrounded by heavy-fermion metals, Ce₃Pd₂₀Si₆ is one of the heaviest-electron systems known to date. Here we used high-resolution neutron spectroscopy to observe low-energy magnetic scattering from a single crystal of this compound in the paramagnetic state. We investigated its temperature dependence and distribution in momentum space, which was not accessible in earlier measurements on polycrystalline samples. At low temperatures, a quasielastic magnetic response with a half-width Γ ≈ 0.1 meV persists with varying intensity all over the Brillouin zone. It forms a broad hump centered at the (111) scattering vector, surrounded by minima of intensity at (002), (220), and equivalent wave vectors. The momentum-space structure distinguishes this signal from a simple crystal-field excitation at 0.31 meV, suggested previously, and rather lets us ascribe it to short-range dynamical correlations between the neighboring Ce ions, mediated by the itinerant heavy f electrons via the Ruderman-Kittel-Kasuya-Yosida mechanism. With increasing temperature, the energy width of the signal follows the conventional T^1/2 law, Γ(T)=Γ0+A√T. Lastly, the momentum-space symmetry of the quasielastic response suggests that it stems from the simple-cubic Ce sublattice occupying the 8c Wyckoff site, whereas the crystallographically inequivalent 4a site remains magnetically silent in this material.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1265377

Alternate ID(s):: OSTI ID: 1179978

Journal Information:: Physical Review B, Vol. 91, Issue 9; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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Multipolar phases and magnetically hidden order: review of the heavy-fermion compound Ce _{1− x} La _x B ₆ Cameron, Alistair S.; Friemel, Gerd; Inosov, Dmytro S. Reports on Progress in Physics, Vol. 79, Issue 6 https://doi.org/10.1088/0034-4885/79/6/066502	journal	May 2016
Magnetic field and doping dependence of low-energy spin fluctuations in the antiferroquadrupolar compound ${Ce}_{1 - x} {La}_{x} B_{6}$ Friemel, G.; Jang, H.; Schneidewind, A. Physical Review B, Vol. 92, Issue 1 https://doi.org/10.1103/physrevb.92.014410	journal	July 2015
Magnetic field dependence of the neutron spin resonance in ${CeB}_{6}$ Portnichenko, P. Y.; Demishev, S. V.; Semeno, A. V. Physical Review B, Vol. 94, Issue 3 https://doi.org/10.1103/physrevb.94.035114	journal	July 2016
Incommensurate short-range multipolar order parameter of phase II in ${Ce}_{3} {Pd}_{20} {Si}_{6}$ Portnichenko, P. Y.; Paschen, S.; Prokofiev, A. Physical Review B, Vol. 94, Issue 24 https://doi.org/10.1103/physrevb.94.245132	journal	December 2016
Doping-induced redistribution of magnetic spectral weight in the substituted hexaborides ${Ce}_{1 - x} {La}_{x} B_{6}$ and ${Ce}_{1 - x} {Nd}_{x} B_{6}$ Nikitin, S. E.; Portnichenko, P. Y.; Dukhnenko, A. V. Physical Review B, Vol. 97, Issue 7 https://doi.org/10.1103/physrevb.97.075116	journal	February 2018
Multipolar phases and magnetically hidden order: Review of the heavy-fermion compound Ce(1-x)La(x)B6 Cameron, A. S.; Friemel, G.; Inosov, D. S. arXiv https://doi.org/10.48550/arxiv.1509.03588	text	January 2015

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Title: Momentum-space structure of quasielastic spin fluctuations in Ce₃Pd₂₀Si₆