Magnetic resonance in the antiferromagnetic and normal state of NH3K3C60

被引：27

作者：

Simon, F

Jánossy, A

Murányi, F

Fehér, T

Shimoda, H

Iwasa, Y

Forró, L

机构：

[1] Tech Univ Budapest, Inst Phys, H-1521 Budapest, Hungary

[2] Japan Adv Inst Sci & Technol, Tatsunokuchi, Ishikawa 9231292, Japan

[3] Ecole Polytech Fed Lausanne, Lab Phys Solides Semicristallins, IGA Dept Phys, CH-1015 Lausanne, Switzerland

来源：

PHYSICAL REVIEW B | 2000年 / 61卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.61.R3826

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on the magnetic resonance of NH3K3C60 powders in the frequency range 9-225 GHz. The observation of an antiferromagnetic resonance below the phase transition at 40 K is evidence for an antiferromagnetically ordered ground state. In the normal state, above 40 K, the temperature dependence of the spin susceptibilty measured by electron-spin resonance agrees with previous static measurements and is too weak to be explained by interacting localized spins in an insulator. The magnetic-resonance linewidth has an unusual magnetic-field dependence which is large and temperature independent in the magnetically ordered state and decreases rapidly above the transition. These observations agree with the suggestion that NH3K3C60 is a metal in the normal state and undergoes a Mott-Hubbard metal to insulator transition at 40 K.

引用

页码：R3826 / R3829

页数：4

共 16 条

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