Spin frustration effects in an odd-member antiferromagnetic ring and the magnetic Mobius strip

被引：47

作者：

Cador, O

GAtteschi, D

Sessoli, R

Barra, AL

Timco, GA

Winpenny, REP

机构：

[1] Univ Florence, Dept Chem, Lab Mol Magnetism, I-50019 Sesto Fiorentino, Italy

[2] Univ Florence, UDR, INSTM, I-50019 Sesto Fiorentino, Italy

[3] CNRS, Lab Champs Magnet Intenses, F-38042 Grenoble, France

[4] Univ Manchester, Dept Chem, Manchester M13 9PL, Lancs, England

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2005年 / 290卷

关键词：

clusters; molecular magnetism; spin frustration; electron paramagnetic resonance;

D O I：

10.1016/j.jmmm.2004.11.159

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The magnetic properties of the first odd-member antiferromagnetic ring comprising eight chromium(III) ions, S =2/3 spins, and one nickel(II) ion, S = 1 spin, are investigated. The ring possesses an even number of unpaired electrons and a S = 0 ground state but, due to competing AF interactions, the first excited spin states are close in energy. The spin frustrated ring is visualized by a Mobius strip. The "knot" of the strip represents the region of the ring where the AF interactions are more frustrated. In the particular case of this bimetallic ring electron paramagnetic resonance (EPR) has unambiguously shown that the frustration is delocalized on the chromium chain, while the antiparallel alignment is more rigid at the nickel site. (c) 2004 Elsevier B.V. All rights reserved.

引用

页码：55 / 60

页数：6

共 24 条

[1] A ferromagnetic ring of six manganese(III) ions with a S=12 ground state [J].