Magnetic properties of TDAE-C60 under pressure

被引：0

作者：

Mizoguchi, K ^{[1
]}

Machino, M ^{[1
]}

Sakamoto, H ^{[1
]}

Kawamoto, T ^{[1
]}

Tokumoto, M ^{[1
]}

Omerzu, A ^{[1
]}

Mihailovic, D ^{[1
]}

机构：

[1] Tokyo Metropolitan Univ, Dept Phys, Hachioji, Tokyo 1920397, Japan

来源：

NANONETWORK MATERIALS: FULLERENES, NANOTUBES AND RELATED SYSTEMS | 2001年 / 590卷

关键词：

D O I：

暂无

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Electron Spin Resonance (ESR) of alpha-TDAE-C-60 in a crystalline form was performed under pressure to investigate the mechanism of ferromagnetic phase transition, where TDAE is tetrakis-dimethylamino-ethylene. Curie temperature T-C decreased parabolically, reaching zero around 9 kbar. It is demonstrated that an antiferro-orbital ordering model of Jahn-Teller distorted C-60(-) anion is consistent with the experimental data, not only qualitatively but also quantitatively. Enough higher pressure than 10 kbar transforms alpha-TDAE-C-60 to beta-type polymerized-form along c-axis with [2+2] cycloadditive mechanism at room temperature. The beta-form is stable even at ambient pressure and up to approximate to430 K. Prominently, in the beta-form, the spin on TDAE(+) cation, Chat was missing in the alpha-form, revives with the ESR g-shift in-between RbC60 polymer and TDAE(+) radical cation.

引用

页码：381 / 384

页数：4

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