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

Kenji Ishii; Akihiko Fujiwara; Hiroyoshi Suematsu; Yoshihiro Kubozono

Ferromagnetism and giant magnetoresistance in the rare-earth fullerides Eu₆-_xSr_xC₆₀

Kenji Ishii, Akihiko Fujiwara, Hiroyoshi Suematsu, Yoshihiro Kubozono

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Abstract

We have studied crystal structure, magnetism, and electric transport properties of a europium fulleride Eu₆C₆₀ and its Sr-substituted compounds, Eu₆-_xSr_xC₆₀. 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 T_C=10-14 K. In EU₆C₆₀, we also confirm the ferromagnetic transition by heat-capacity measurement. The striking feature in Eu₆-_xSr_xC₆₀ 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 language	English
Article number	134431
Pages (from-to)	1344311-1344316
Number of pages	6
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	65
Issue number	13
Publication status	Published - Apr 1 2002

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Cite this

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title = "Ferromagnetism and giant magnetoresistance in the rare-earth fullerides Eu6-xSrxC60 ",

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.",

author = "Kenji Ishii and Akihiko Fujiwara and Hiroyoshi Suematsu and Yoshihiro Kubozono",

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T1 - Ferromagnetism and giant magnetoresistance in the rare-earth fullerides Eu6-xSrxC60

AU - Ishii, Kenji

AU - Fujiwara, Akihiko

AU - Suematsu, Hiroyoshi

AU - Kubozono, Yoshihiro

PY - 2002/4/1

Y1 - 2002/4/1

N2 - 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.

AB - 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.

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Ferromagnetism and giant magnetoresistance in the rare-earth fullerides Eu₆-_xSr_xC₆₀

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ASJC Scopus subject areas

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