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We have studied crystal structure, magnetism and electric transportproperties 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 measurementsrevealed 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. InEu6C60, we also confirm the ferromagnetic transition by heat capacitymeasurement. The striking feature in Eu6-xSrxC60} is very large negativemagnetoresistance at low temperature; the resistivity ratio \rho(H = 9T)/\rho(H = 0 T) reaches almost 10^{-3} at 1 K in Eu6C60. Such largemagnetoresistance is the manifestation of a strong pi-f interaction betweenconduction carriers on C60 and 4f electrons of Eu.Comment: 5 pages, 4 figure

physical review. b, condensed matter

Ferromagnetism and giant magnetoresistance in the rare-earth fullerides<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Eu</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml…

Ferromagnetism and giant magnetoresistance in the rare-earth fulleridesEu6−xSrx