BEDT-TTF salts with alpha-keggin polyoxometallates: Synthesis and magnetism of (BEDT-TTF)(8)[PMo3NbW8O40]: A possible Spin-Peierls system.

被引：5

作者：

Bellitto, C

Bonamico, M

Peng, J

机构：

来源：

SYNTHETIC METALS | 1997年 / 85卷 / 1-3期

关键词：

organic conductor based on radical-cation salts; electrocrystallization; magnetic and transport measurements;

D O I：

10.1016/S0379-6779(97)80359-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Electrical and magnetic properties of the new radical-cation salt (BEDT-TTF)(8)[PMo3NbW8O40] are reported. The compound is a semiconductor, sigma(rt) = 0.037Scm(-1) with an activation energy E-a=160meV. The magnetic susceptibility (30-300K) has been fitted according to a uniform (S=1/2) 1D Heisenberg model of nearly ionised BEDT-TTF molecules, by using the g-value of 2.005 and the exchange constant J/k(B)=-60K. Below 20K, a Curie-like tail is present and the C-value is approximately 1/3 of that corresponding to one unpaired electron for formula-unit. If the tail is subtracted to the total magnetic susceptibility, a sharp fall in susceptibility at about 7K is observed, and this is probably associated with a Spin-Peierls distortion.

引用

页码：1583 / 1584

页数：2

共 21 条

[11] EPR OF BEDT-TTF SALTS WITH THE MAGNETIC CLUSTER[PMO12O40](4-) AND THE NON MAGNETIC [SIW12O40](4-) [J].