A magnon band analysis of GdRu2Si2 in the field-polarized state

IF 5.4 1区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

npj Quantum Materials Pub Date : 2025-04-16 DOI:10.1038/s41535-025-00755-6

G. D. A. Wood, J. R. Stewart, D. A. Mayoh, J. A. M. Paddison, J. Bouaziz, S. M. Tobin, O. A. Petrenko, M. R. Lees, P. Manuel, J. B. Staunton, G. Balakrishnan

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Abstract

Understanding the formation of skyrmions in centrosymmetric materials is a problem of fundamental and technological interest. GdRu₂Si₂ is a candidate material that hosts a variety of multi-Q magnetic phases, including in zero-field. Here, inelastic neutron scattering is used to measure the spin excitations in the field-polarized phase of GdRu₂Si₂. Linear spin wave theory and a method of interaction invariant path analysis are used to derive a Hamiltonian accounting for the spectra. The Hamiltonian, dominated by bilinear (Ruderman-Kittel-Kasuya-Yosida) Heisenberg exchange, compares favorably to ab initio calculations. Dipolar interactions are a secondary energy scale to consider, with J_D.D~ 0.05J_RKKY. However, it is shown that in the field-polarized phase the dipolar interactions ‘self screen’ so that their effect is largely suppressed. No specific evidence for higher-order exchange is found. These aspects are discussed in the context of the lower field multi-Q states and the anisotropy of the system.

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场极化态下GdRu2Si2的磁振子带分析

了解中心对称材料中天际线的形成是一个基础和技术兴趣问题。GdRu2Si2是一种具有多种多q磁相的候选材料，包括零场。本文采用非弹性中子散射法测量了GdRu2Si2的场极化相的自旋激发。利用线性自旋波理论和相互作用不变路径分析方法推导了光谱的哈密顿方程。由双线性海森堡交换（ruderman - kittel - kasuyya - yosida）主导的哈密顿量比从头计算更有优势。偶极相互作用是一个次要的能量尺度来考虑，与JD。D ~ 0.05 jrkky。然而，研究表明，在场极化阶段，偶极相互作用“自我屏蔽”，因此它们的影响在很大程度上被抑制。没有发现高阶交换的具体证据。这些方面在低场多q态和系统各向异性的背景下进行了讨论。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

npj Quantum Materials Materials Science-Electronic, Optical and Magnetic Materials

CiteScore

10.60

自引率

3.50%

发文量

107

审稿时长

6 weeks

期刊介绍： npj Quantum Materials is an open access journal that publishes works that significantly advance the understanding of quantum materials, including their fundamental properties, fabrication and applications.