Ferromagnetism and giant magnetoresistance in the rare-earth fullerides Eu6-xSrxC60

Kenji Ishii, Akihiko Fujiwara, Hiroyoshi Suematsu, Yoshihiro Kubozono

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29 Citations (Scopus)

Abstract

We have studied crystal structure, magnetism, and electric transport properties of a europium fulleride Eu6C60 and its Sr-substituted compounds, Eu6-xSrxC60. They have a bcc structure, which is an isostructure of other M6C60 (M represents an alkali atom or an alkaline-earth atom). Magnetic measurements revealed that magnetic moment is ascribed to the divalent europium atom with S=7/2 spin, and a ferromagnetic transition was observed at TC=10-14 K. In EU6C60, we also confirm the ferromagnetic transition by heat-capacity measurement. The striking feature in Eu6-xSrxC60 is very large negative magnetoresistance at low temperature; the resistivity ratio p(H=9 T)/p(H=0 T) reaches almost 10-3 at Eu6C60. Such large magnetoresistance is the manifestation of a strong π-f interaction between conduction carriers on C60 and 4f electrons of Eu.

Original languageEnglish
Article number134431
Pages (from-to)1344311-1344316
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number13
Publication statusPublished - Apr 1 2002

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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