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Momentum-space structure of quasielastic spin fluctuations in Ce3Pd20Si6

Portnichenko, P. Y.; Cameron, A. S.; Surmach, M. A.; Deen, Pascale LU ; Paschen, S.; Prokofiev, A.; Mignot, J. -M.; Strydom, A. M.; Telling, M. T. F. and Podlesnyak, A., et al. (2015) In Physical Review B (Condensed Matter and Materials Physics) 91(9).
Abstract
Among 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 Gamma approximate to 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... (More)
Among 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 Gamma approximate to 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, Gamma(T) = Gamma(0) + A root T. 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. (Less)
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Physical Review B (Condensed Matter and Materials Physics)
volume
91
issue
9
publisher
American Physical Society
external identifiers
  • wos:000351431800001
  • scopus:84925847456
ISSN
1098-0121
DOI
10.1103/PhysRevB.91.094412
language
English
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yes
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c0d3fc78-9228-4074-ac5d-b8919e263d3f (old id 5287854)
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2015-04-24 14:00:53
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2017-07-30 04:00:15
@article{c0d3fc78-9228-4074-ac5d-b8919e263d3f,
  abstract     = {Among 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 Gamma approximate to 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, Gamma(T) = Gamma(0) + A root T. 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.},
  articleno    = {094412},
  author       = {Portnichenko, P. Y. and Cameron, A. S. and Surmach, M. A. and Deen, Pascale and Paschen, S. and Prokofiev, A. and Mignot, J. -M. and Strydom, A. M. and Telling, M. T. F. and Podlesnyak, A. and Inosov, D. S.},
  issn         = {1098-0121},
  language     = {eng},
  number       = {9},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Momentum-space structure of quasielastic spin fluctuations in Ce3Pd20Si6},
  url          = {http://dx.doi.org/10.1103/PhysRevB.91.094412},
  volume       = {91},
  year         = {2015},
}