Investigation by spherical neutron polarimetry of magnetic properties in BaCo2(ASO4)2

被引：11

作者：

Regnault, L. P. ^{[1
]}

Boullier, C. ^{[1
]}

Henry, J. Y. ^{[1
]}

机构：

[1] CEA Grenoble, DRFMC, SPSMS, MDN, F-38054 Grenoble 9, France

来源：

PHYSICA B-CONDENSED MATTER | 2006年 / 385卷

关键词：

polarized neutron scattering; spherical polarimetry; magnetic excitations; 2D systems;

D O I：

10.1016/j.physb.2006.05.142

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The cobaltite BaCo2(ASO(4))(2) (BCAO) is a good realization of the quasi-2D system in which the Co2+ ions form a magnetically frustrated honeycomb lattice with magnetic moments mainly confined in the basal planes. Below T-N = 5.35 +/- 0.5 K, the ground state structure is described by an incommensurate propagation vector k approximate to (0.265, 0, -1.33) and the magnetic excitation spectrum displays a resolution-limited energy gap do P Delta(0) approximate to 1.45meV at q = 0. No magnetic excitations emerging from q = k could be detected, contrary to what would be expected for a simple helimagnetic ground state. In order to understand these puzzling results, we have recently re-investigated the magnetic structure and excitations in BCAO using spherical neutronpolarization analysis. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：425 / 427

页数：3