Synthesis, structure, and magnetic properties of the fullerene-based ferromagnets Eu3C70 and Eu9C70

Taishi Takenobu, Dam H. Chi, Serena Margadonna, Kosmas Prassides, Yoshihiro Kubozono, Andrew N. Fitch, Ken ichi Kato, Yoshihiro Iwasa

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Intercalation of C70 with europium affords two kinds of magnetic compounds, a canted antiferromagnet EuxC70 (X ≈ 3) and a ferromagnet ExC70 (x ≈ 9) with transition temperatures (Tc) of 5 and 38 K, respectively. The Curie constants in the paramagnetic phase and the saturation moment in the ferromagnetic phase are both understood by the full moment of Eu2+ for both systems. The structure of Eu3-δC70 (δ ≈ 0.27) is pseudo-monoclinic, derived by a simple deformation of the parent face-centered cubic (fcc) structure. Eu9-δC70 (δ ≈ 0.2) forms an fcc structure, in which cuboctahedral clustering of Eu2+ ions is observed in the enhanced size octahedral holes. The observed Tc of the Eu9-δC70 ferromagnet is comparable to or larger than those of simple binary Eu-based ferromagnets, such as Eu chalcogenides or carbides, despite the low atomic ratio of Eu in the chemical formulas. This can be understood by the short Eu2+-Eu2+ distances and high coordination numbers permitted by the multiple occupation by Eu2+ ions of the expanded octahedral interstitial sites in higher fullerene-based solids.

Original languageEnglish
Pages (from-to)1897-1904
Number of pages8
JournalJournal of the American Chemical Society
Volume125
Issue number7
DOIs
Publication statusPublished - 2003 Feb 15
Externally publishedYes

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Fullerenes
Magnets
Magnetic properties
Ions
Europium
Chalcogenides
Intercalation
Superconducting transition temperature
Carbides
Transition Temperature
Occupations
Cluster Analysis

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Takenobu, T., Chi, D. H., Margadonna, S., Prassides, K., Kubozono, Y., Fitch, A. N., ... Iwasa, Y. (2003). Synthesis, structure, and magnetic properties of the fullerene-based ferromagnets Eu3C70 and Eu9C70 Journal of the American Chemical Society, 125(7), 1897-1904. https://doi.org/10.1021/ja0288690

Synthesis, structure, and magnetic properties of the fullerene-based ferromagnets Eu3C70 and Eu9C70 . / Takenobu, Taishi; Chi, Dam H.; Margadonna, Serena; Prassides, Kosmas; Kubozono, Yoshihiro; Fitch, Andrew N.; Kato, Ken ichi; Iwasa, Yoshihiro.

In: Journal of the American Chemical Society, Vol. 125, No. 7, 15.02.2003, p. 1897-1904.

Research output: Contribution to journalArticle

Takenobu, T, Chi, DH, Margadonna, S, Prassides, K, Kubozono, Y, Fitch, AN, Kato, KI & Iwasa, Y 2003, 'Synthesis, structure, and magnetic properties of the fullerene-based ferromagnets Eu3C70 and Eu9C70 ', Journal of the American Chemical Society, vol. 125, no. 7, pp. 1897-1904. https://doi.org/10.1021/ja0288690
Takenobu, Taishi ; Chi, Dam H. ; Margadonna, Serena ; Prassides, Kosmas ; Kubozono, Yoshihiro ; Fitch, Andrew N. ; Kato, Ken ichi ; Iwasa, Yoshihiro. / Synthesis, structure, and magnetic properties of the fullerene-based ferromagnets Eu3C70 and Eu9C70 In: Journal of the American Chemical Society. 2003 ; Vol. 125, No. 7. pp. 1897-1904.
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