Electronic structure study of KxC60 compounds with x>6

被引：27

作者：

Maxwell, AJ ^{[1
]}

Bruhwiler, PA ^{[1
]}

Andersson, S ^{[1
]}

Martensson, N ^{[1
]}

Rudolf, P ^{[1
]}

机构：

[1] FAC UNIV NOTRE DAME PAIX,INTERDISCIPLINAIRE SPECT ELECTRON LAB,B-5000 NAMUR,BELGIUM

来源：

CHEMICAL PHYSICS LETTERS | 1995年 / 247卷 / 03期

关键词：

D O I：

10.1016/0009-2614(95)01206-1

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We present C 1s X-ray absorption and photoemission results for KxC60 with x > 6, the so-called 'superfullerides'. These are the first measurements of the unoccupied valence band for these systems and confirm that more than six electrons can be transferred to each fullerene. We observe saturation of the K-to-C-60 charge transfer, with part of the t(1g) LUMO + 1 orbital remaining unoccupied, so that fewer than 12 electrons are accepted per C-60 molecule. This fullerene state exhibits metallic behaviour, while a transition to insulating behaviour is observed as lower charge states are formed by adding more C-60. The superfullerides appear to follow the pattern of strongly correlated solids.

引用

页码：257 / 263

页数：7

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