Investigation of the spin exchange interactions in the nanotube system Na2V3O7 by spin dimer analysis

被引：19

作者：

Whangbo, MH ^{[1
]}

Koo, HJ ^{[1
]}

机构：

[1] N Carolina State Univ, Dept Chem, Raleigh, NC 27695 USA

来源：

SOLID STATE COMMUNICATIONS | 2000年 / 115卷 / 12期

关键词：

nanostructures; crystal structure and symmetry; spin-orbit effects;

D O I：

10.1016/S0038-1098(00)00258-1

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The relative magnitudes of the spin exchange interactions expected for the nanotubes of Na2V3O7 were examined by identifying the spin dimers of the nanotube and calculating their spin orbital interaction energies. Our analysis indicates that the spin exchange interactions of the nanotube are not described by three-legged ladders, but by six mutually intersecting helical chains, and the magnetic properties of the nanotube in the low temperature region can be well approximated by those of a single helical chain. Each helical chain is described by four antiferromagnete spin exchange parameters J(1)-J(4) With the repeat sequence [-J(2)-J(1)-J(3)-J(4)-](infinity) where \J(1)\ > \J(2)\ > \J(3)\ > \J(4)\. The nanotube is expected to have a spin gap. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：675 / 678

页数：4

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