A theoretical model for ferromagnetism of TDAE-C-60

被引：52

作者：

Kawamoto, T

机构：

[1] Department of Material Physics, Faculty of Engineering Science, Osaka University, Toyonaka 560

来源：

SOLID STATE COMMUNICATIONS | 1997年 / 101卷 / 04期

关键词：

fullerenes; exchange and superexchange; phase transitions;

D O I：

10.1016/S0038-1098(96)00584-4

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

A new mechanism to cause for ferromagnetism of C-60 complexes with tetrakis(dimethylamino)ethylene (TDAE) is proposed. This mechanism is based on charge-transfer induced intramolecular Jahn-Teller (CTJT) distortion and intermolecular cooperative Jahn-Teller (CJT) distortion, and ferromagnetism is caused by orbital ordering. The magnitude of CTJT distortion has been estimated by semi-empirical molecular orbital (MO) calculations for a single C-60 anion. The CJT distortion and ferromagnetism have been investigated with use of exact diagonalization procedure for one-dimensional multi-band Hubbard Hamiltonian. Finally we propose possible JT-distorted crystal structures which are likely to exhibit three-dimensional ferromagnetic ordering. We also suggest certain measurements which may confirm the proposed model. Copyright (C) 1996 Elsevier Science Ltd

引用

页码：231 / 235

页数：5

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