Spin configuration of Gd-13 clusters

被引：51

作者：

Pappas, DP ^{[1
]}

Popov, AP ^{[1
]}

Anisimov, AN ^{[1
]}

Reddy, BV ^{[1
]}

Khanna, SN ^{[1
]}

机构：

[1] MOSCOW ENGN PHYS INST,DEPT MOLEC PHYS,MOSCOW 115409,RUSSIA

来源：

PHYSICAL REVIEW LETTERS | 1996年 / 76卷 / 23期

关键词：

D O I：

10.1103/PhysRevLett.76.4332

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The structure and spin configuration of a Gd-13 cluster has been examined using theoretical electronic structure calculations and a Heisenberg model. The structure calculations show that the ground state geometry of the cluster has an hcp arrangement with a slightly reduced nearest-neighbor distance compared to bulk and an average moment of 7.8 mu B/atom. The Heisenberg model is calculated using an RKKY-like interaction. The effects of competing ferromagnetic and antiferromagnetic coupling for the nearest- and next-nearest-neighbor interaction, respectively, is investigated. It is shown that for a range of interaction strengths the spins assume a canted configuration. This effect leads to lower net magnetization of the cluster, and accounts for the anomalous low moments of Gd-n clusters which have been experimentally observed.

引用

页码：4332 / 4335

页数：4