The Electronic structures of fullerene/transition-metal hybrid material

Matsumoto, Yoshihiro; Sakai, Seiji; Naramoto, Hiroshi*; Hirao, Norie*; Baba, Yuji ; Shimada, Toshihiro*; Sugai, Isamu; Takanashi, Koki; Maeda, Yoshihito

Recently, we have found the appearance of substantial MR ratio (80%) in a C $_{60}$ /Co hybrid material. Such the MR ratio cannot be explained enough only by tunnel conduction through Co grains. Therefore, to obtain information about electronic structures of C $_{60}$ /Co hybrid material is necessary. Absorption spectra of C $_{60}$ Co are different from that of pristine C $_{60}$ . In particular, peak intensity corresponding to (LUMO) C 1s excitation of C $_{60}$ Co is clearly attenuated. In addition, C 1s photoelectron peak of C $_{60}$ Co slightly shifted to lower binding energy compared to that of pristine C $_{60}$ . These results indicate that 3d electron of Co transfers to orbital of C $_{60}$ and new electronic states are formed in the C $_{60}$ -Co compound. In fact, XPS spectra of valence excitation region also demonstrate the formation of hybrid orbital near the Fermi level due to the coupling of C $_{60}$ and Co.

Language	:	English
Journal	:	Materials Research Society Symposium Proceedings, Vol.1081 (Internet)
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Pages	:	6 Pages
Publication Year/Month	:	2008/03
Meeting title	:	Materials Research Society 2008 Spring Meeting
Held date	:	2008/03
Location (city)	:	San Francisco
Location (country)	:	U.S.A.
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Keywords	:	no keyword
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Registration No. : BB20073601
JAEA Abstracts No. :
Paper Submission No. : 6558

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