Momentum-space structure of quasielastic spin fluctuations in Ce3Pd20Si6
Abstract
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 T1/2 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.
- Authors:
-
- 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 L´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)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1265377
- Alternate Identifier(s):
- OSTI ID: 1179978
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 91; Journal Issue: 9; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Citation Formats
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., and Inosov, D. S. Momentum-space structure of quasielastic spin fluctuations in Ce3Pd20Si6. United States: N. p., 2015.
Web. doi:10.1103/PhysRevB.91.094412.
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. Momentum-space structure of quasielastic spin fluctuations in Ce3Pd20Si6. United States. https://doi.org/10.1103/PhysRevB.91.094412
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., and Inosov, D. S. Fri .
"Momentum-space structure of quasielastic spin fluctuations in Ce3Pd20Si6". United States. https://doi.org/10.1103/PhysRevB.91.094412. https://www.osti.gov/servlets/purl/1265377.
@article{osti_1265377,
title = {Momentum-space structure of quasielastic spin fluctuations in Ce3Pd20Si6},
author = {Portnichenko, P. Y. and Cameron, A. S. and Surmach, M. A. and Deen, Pascale P. and Paschen, S. and Prokofiev, A. and Mignot, Jean-Michel and Strydom, A. M. and Telling, Mark T. F. and Podlesnyak, Andrey A. and Inosov, D. S.},
abstractNote = {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 T1/2 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.},
doi = {10.1103/PhysRevB.91.094412},
journal = {Physical Review B},
number = 9,
volume = 91,
place = {United States},
year = {Fri Mar 13 00:00:00 EDT 2015},
month = {Fri Mar 13 00:00:00 EDT 2015}
}
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