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  Doping-induced redistribution of magnetic spectral weight in the substituted hexaborides Ce1-xLaxB6 and Ce1-xNdxB6

Nikitin, S. E., Portnichenko, P. Y., Dukhnenko, A. V., Shitsevalova, N. Y., Filipov, V. B., Qiu, Y., et al. (2018). Doping-induced redistribution of magnetic spectral weight in the substituted hexaborides Ce1-xLaxB6 and Ce1-xNdxB6. Physical Review B, 97(7): 075116, pp. 1-9. doi:10.1103/PhysRevB.97.075116.

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 Creators:
Nikitin, S. E.1, Author              
Portnichenko, P. Y.2, Author
Dukhnenko, A. V.2, Author
Shitsevalova, N. Yu.2, Author
Filipov, V. B.2, Author
Qiu, Y.2, Author
Rodriguez-Rivera, J. A.2, Author
Ollivier, J.2, Author
Inosov, D. S.2, Author
Affiliations:
1Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
2External Organizations, ou_persistent22              

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 Abstract: We investigate the doping-induced changes in the electronic structure of CeB6 on a series of substituted Ce1-xRxB6 samples (R = La, Nd) using diffuse neutron scattering. We observe a redistribution of magnetic spectral weight across the Brillouin zone, which we associate with the changes in the Fermi-surface nesting properties related to the modified charge carrier concentration. In particular, a strong diffuse peak at the corner of the Brillouin zone (R point), which coincides with the propagation vector of the elusive antiferroquadrupolar (AFQ) order in CeB6, is rapidly suppressed by both La and Nd doping, like the AFQ order itself. The corresponding spectral weight is transferred to the X(001/2) point, ultimately stabilizing a long-range AFM order at this wave vector at the Nd-rich side of the phase diagram. At an intermediate Nd concentration, a broad diffuse peak with multiple local maxima of intensity is observed around the X point, evidencing itinerant frustration that gives rise to multiple ordered phases for which Ce1-xNdxB6 is known. On the La-rich side of the phase diagram, however, dilution of the magnetic moments prevents the formation of a similar (001/2)-type order despite the presence of nesting. Our results demonstrate how diffuse neutron scattering can be used to probe the nesting vectors in complex f-electron systems directly, without reference to the single-particle band structure, and emphasize the role of Fermi surface geometry in stabilizing magnetic order in rare-earth hexaborides.

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Language(s): eng - English
 Dates: 2018-02-092018-02-09
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.1103/PhysRevB.97.075116
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 97 (7) Sequence Number: 075116 Start / End Page: 1 - 9 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008