Insulator-metal transition in Rb4C60 under pressure from C-13-NMR

被引：49

作者：

Kerkoud, R ^{[1
]}

AubanSenzier, P ^{[1
]}

Jerome, D ^{[1
]}

Brazovskii, S ^{[1
]}

LukYanchuk, I ^{[1
]}

Kirova, N ^{[1
]}

Rachdi, F ^{[1
]}

Goze, C ^{[1
]}

机构：

[1] UNIV MONTPELLIER 2,DYNAM PHASES CONDENSEES GRP,F-34060 MONTPELLIER,FRANCE

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 1996年 / 57卷 / 02期

关键词：

fullerenes; high pressure; nuclear magnetic resonance (NMR); superconductivity;

D O I：

10.1016/0022-3697(95)00113-1

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We present an NMR study of Rb4C60 performed under pressure up to 12 kbar. The temperature dependence of the C-13 spin-lattice relaxation rate is activated at ambient pressure and becomes Korringa-like under pressure. The behaviour of the relaxation is interpreted in terms of one channel due to excited intramolecular tripler states above the Jahn-Teller ground state plus another one related to electron-hole excitations through an indirect band gap. In spite of a finite value of the density of states at the Fermi level indicated by the NMR data under pressure, no superconductivity could be detected at 15 kbar above 0.4 K.

引用

页码：143 / 152

页数：10

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