Magnetic excitations and quadrupolar ordering in UNiSn

被引：7

作者：

McEwen, KA

Bull, MJ

Eccleston, RS

机构：

[1] UCL, Dept Phys & Astron, London WC1E 6BT, England

[2] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England

来源：

PHYSICA B-CONDENSED MATTER | 2000年 / 281卷

基金：

英国工程与自然科学研究理事会;

关键词：

quadrupolar and magnetic phases; UNiSn; crystal field excitations;

D O I：

10.1016/S0921-4526(99)00946-1

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

UNiSn transforms from a paramagnetic semiconductor to an antiferromagnetic metal at T(N) = 43 K. We have made a detailed neutron scattering study of UNiSn and find well-defined magnetic excitations in the metallic phase, at 10 and 35 meV, with no evidence of excitations at higher energies. The excitations persist in the semiconducting phase, but their lifetime changes rapidly above T(N). High-resolution studies reveal a temperature-dependent splitting of the 10 meV peak, consistent with a tetragonal strain induced by quadrupolar ordering. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：600 / 601

页数：2