Analysis of the crystal lattice instability for cage–cluster systems using the superatom model

Serebrennikov, D. A.; Clementyev, E. S.; Alekseev, P. A.

doi:10.1134/s1063776116070220

Cited by 11 publications

(1 citation statement)

References 14 publications

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“…The rattling motion in the boride series leads to flat phonon branches that can be interpreted as low energy (hω E 10 meV) Einstein modes of RE ions in oversized B 6 cages. It is most prominent for some heavier RE (Gd, Dy, Tb) hexaborides due to the lanthanide contraction of RE ionic radii [22][23][24]. The anharmonic low energy rattling phonons are in contrast to the extremely stiff motion of the boron cage as witnessed by the very large longitudinal elastic constants [25].…”

Section: Introductionmentioning

confidence: 99%

Multipolar order and excitations in rare-earth boride Kondo systems

Thalmeier¹,

Akbari²,

Shiina³

2019

Preprint

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The cubic rare-earth boride series displays diverse electronic states like localized 4 f electron multiplets split by the crystal electric field (CEF), itinerant heavy-fermion quasiparticle bands of the Kondo lattice as well as gapped Kondo insulator or mixed-valent semiconductor states. Furthermore, at low temperatures fairly exotic ordered states may appear due to the "hidden" order of multipoles carried by degenerate CEF multiplets, in addition to common (dipolar) magnetic order present in many RB 6 (R = rare earth) systems. Most prominent are CeB 6 and its La-diluted alloys Rare-Earth Borides Dmytro S. Inosov (ed.

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