Low-moment antiferromagnetic ordering in triply charged cubic fullerides close to the metal-insulator transition

被引：21

作者：

Jeglic, P. ^{[1
]}

Arcon, D. ^{[1
,2
]}

Potocnik, A. ^{[1
]}

Ganin, A. Y. ^{[3
]}

Takabayashi, Y. ^{[4
]}

Rosseinsky, M. J. ^{[3
]}

Prassides, K. ^{[4
]}

机构：

[1] Jozef Stefan Inst, Ljubljana 1000, Slovenia

[2] Univ Ljubljana, Fac Math & Phys, Ljubljana 1000, Slovenia

[3] Univ Liverpool, Dept Chem, Liverpool L69 7ZD, Merseyside, England

[4] Univ Durham, Dept Chem, Durham DH1 3LE, England

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 19期

基金：

英国工程与自然科学研究理事会;

关键词：

antiferromagnetic materials; caesium compounds; fullerene compounds; ground states; magnetic moments; magnetic structure; magnetic transitions; metal-insulator transition; nuclear magnetic resonance; nuclear spin-lattice relaxation; superconducting materials; superconducting transitions; NMR EVIDENCE; C-13; NMR; SUPERCONDUCTIVITY; C-60; (NH3)K3C60;

D O I：

10.1103/PhysRevB.80.195424

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on the ambient pressure (13)C and (133)Cs NMR study of disorder-free A15-structured Cs(3)C(60), which shows non-BCS superconductivity at 38 K under pressure. Temperature-independent (13)C and (133)Cs spin-lattice relaxation rates prove an insulating ground state with a small effective magnetic moment 1.3-1.6 mu(B) for T>100 K. Below 46 K, A15 Cs(3)C(60) orders into an antiferromagnetic structure best described by a magnetic wave vector, q=(1/2, 1/2, 1/2) with a staggered magnetic moment similar to 0.9 mu(B) per C(60). The large (U/W) ratio (similar to 2.2), the opening of a gap in the electronic excitation spectrum and the small C(60)(3-) magnetic moment all underline the importance of electronic correlations in A15 Cs(3)C(60).

引用

页数：5

共 24 条

[1] Metal-insulator transition and molecular dynamics in (NH3)K3C60 [J].