Doping-induced redistribution of magnetic spectral weight in substituted hexaborides Ce$_{1-x}$La$_x$B$_6$ and Ce$_{1-x}$Nd$_x$B$_6$

S. E. Nikitin; P. Y. Portnichenko; A. V. Dukhnenko; N. Yu. Shitsevalova; V. B. Filipov; Y. Qiu; J. A. Rodriguez-Rivera; J. Ollivier; D. S. Inosov

doi:10.1103/PhysRevB.97.075116

paper

Doping-induced redistribution of magnetic spectral weight in substituted hexaborides Ce $_{1 - x}$ La $_{x}$ B $_{6}$ and Ce $_{1 - x}$ Nd $_{x}$ B $_{6}$

arXiv:1712.07913 · doi:10.1103/PhysRevB.97.075116

Abstract

We investigate the doping-induced changes in the electronic structure of CeB $_{6}$ on a series of substituted Ce $_{1 - x} R_{x}$ B $_{6}$ 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 CeB $_{6}$ , is rapidly suppressed by both La and Nd doping, like the AFQ order itself. The corresponding spectral weight is transferred to the $X (00 \frac{1}{2})$ 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 Ce $_{1 - x}$ Nd $_{x}$ B $_{6}$ is known. On the La-rich side of the phase diagram, however, dilution of the magnetic moments prevents the formation of a similar $(00 \frac{1}{2})$ -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.

arXiv comment8 pages, 5 figures

Doping-induced redistribution of magnetic spectral weight in substituted hexaborides Ce $_{1 - x}$ La $_{x}$ B $_{6}$ and Ce $_{1 - x}$ Nd $_{x}$ B $_{6}$

Abstract

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Doping-induced redistribution of magnetic spectral weight in substituted hexaborides Ce1−x​Lax​B6​ and Ce1−x​Ndx​B6​

Abstract

References in corpus (42)

Cited by in corpus (6)

Doping-induced redistribution of magnetic spectral weight in substituted hexaborides Ce $_{1 - x}$ La $_{x}$ B $_{6}$ and Ce $_{1 - x}$ Nd $_{x}$ B $_{6}$