电荷条纹有序的LaNiO中磁布拉格反射和低能磁激发的波矢差

Wave Vector Difference of Magnetic Bragg Reflections and Low Energy Magnetic Excitations in Charge-stripe Ordered LaNiO.

作者信息

Freeman P G, Giblin S R, Skoulatos M, Mole R A, Prabhakaran D

机构信息

Jeremiah Horrocks Institute for Mathematics, Physics, and Astronomy, University of Central Lancashire, Preston, PR1 2HE, UK.

Laboratory for Quantum Magnetism, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015, Lausanne, Switzerland.

出版信息

Sci Rep. 2019 Oct 8;9(1):14468. doi: 10.1038/s41598-019-50904-8.

DOI:10.1038/s41598-019-50904-8

PMID:31594985

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6783545/

Abstract

We report on the magnetism of charge-stripe ordered LaNiO by neutron scattering and μSR. On going towards zero energy transfer there is an observed wave vector offset in the centring of the magnetic excitations and magnetic Bragg reflections, meaning the excitations cannot be described as Goldstone modes of the magnetic order. Weak transverse field μSR measurements determine the magnetically order volume fraction is 87% from the two stripe twins, and the temperature evolution of the magnetic excitations is consistent with the low energy excitations coming from the magnetically ordered volume of the material. We will discuss how these results contrast with the proposed origin of a similar wave vector offset recently observed in a La-based cuprate, and possible origins of this effect in LaNiO.

摘要

我们通过中子散射和μ子自旋弛豫（μSR）报告了电荷条纹有序的LaNiO的磁性。在趋近于零能量转移时，在磁激发和磁布拉格反射的中心观察到波矢偏移，这意味着这些激发不能被描述为磁序的戈德斯通模式。弱横向场μSR测量确定，来自两个条纹孪晶的磁有序体积分数为87%，并且磁激发的温度演化与来自材料磁有序体积的低能激发一致。我们将讨论这些结果如何与最近在一种基于La的铜酸盐中观察到的类似波矢偏移的提出的起源形成对比，以及这种效应在LaNiO中的可能起源。