Vanishing RKKY interactions in Ce-based cage compounds

Konic, A. M.; Zhu, Y.; Breindel, A. J.; Deng, Y.; Moir, C. M.; Maple, M. B.; Almasan, C. C.; Dzero, M.

doi:10.1088/1361-648X/acf019

Title: Vanishing RKKY interactions in Ce-based cage compounds

Journal Article · 24 August 2023 · Journal of Physics. Condensed Matter

DOI: https://doi.org/10.1088/1361-648X/acf019 · OSTI ID:1996885

Konic, A. M.; Zhu, Y.; Breindel, A. J.; Deng, Y.; Moir, C. M.; Maple, M. B.; Almasan, C. C.;

Abstract We report the results of thermodynamic measurements in external magnetic field of the cubic Ce-based cage compounds Ce T ₂ Cd ₂₀ ( T = Ni,Pd). Our analysis of the heat-capacity data shows that the Γ ₇ doublet is the ground state multiplet of the Ce ³⁺ ions. Consequently, for the Γ ₇ doublet it can be theoretically shown that the Ruderman–Kittel–Kasuya–Yosida interaction between the localized Ce moments mediated by the conduction electrons, must vanish at temperatures much lower than the energy separating the ground state doublet from the first excited Γ ₈ quartet. Our findings provide an insight as to why no long range order has been observed in these compounds down to temperatures in the milliKelvin range.

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Research Organization:: Princeton Univ., NJ (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-84ER45105

OSTI ID:: 1996885

Journal Information:: Journal of Physics. Condensed Matter, Journal Name: Journal of Physics. Condensed Matter Journal Issue: 46 Vol. 35; ISSN 0953-8984

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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