Element-Specific Magnetic Properties of Di-Erbium Er2@C82 and Er2C2@C82 Metallofullerenes: A Synchrotron Soft X-ray Magnetic Circular Dichroism S

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• 作者：Haruya Okimoto ; Ryo Kitaura ; Tetsuya Nakamura ; Yasuhiro Ito ; Yutaka Kitamura ; Takao Akachi ; Daisuke Ogawa ; Naoki Imazu ; Yuko Kato ; Yuki Asada ; Toshiki Sugai ; Hitoshi Osawa ; Tomohiro Matsushita ; Takayu
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：April 17, 2008
• 年：2008
• 卷：112
• 期：15
• 页码：6103 - 6109
• 全文大小：381K
• 年卷期：v.112,no.15(April 17, 2008)
• ISSN：1932-7455

文摘

The magnetic properties of mono- and dierbium(Er) metallofullerenes have been studied by means of asynchrotron soft X-ray magnetic circular dichroism (SXMCD) technique. The effective magnetic moment ofthe Er ions has been estimated to be 8.48 _B and is independent of the number of Er ions encapsulated insidethe fullerene cage. These Er metallofullerenes exhibit an antiferromagnetic-like behavior at low temperaturesthat is stronger in Er@C₈₂(C_2v isomer) monometallofullerene than in Er₂@C₈₂(C_2v) and Er₂C₂@C₈₂(C_2v)dimetallofullerenes. The result suggests that the unpaired spin on the monometallofullerene cages causes anindirect magnetic interaction between Er 4f spins of neighboring metallofullerenes. Furthermore, we havefound that the Weiss temperatures of the metallofullerene remain the same even when one of the Er ions inEr₂C₂@C₈₂(C_s) is replaced by a nonmagnetic Y ion (i.e., ErYC₂@C₈₂). The results indicate that interactionbetween the two Er ions in the same fullerene cage does not contribute significantly to the overall magneticproperties.