Anisotropic Skyrmion and Multi- q Spin Dynamics in Centrosymmetric Gd2PdSi3

IF 9 1区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Physical review letters Pub Date : 2025-01-29 DOI:10.1103/physrevlett.134.046702

M. Gomilšek, T. J. Hicken, M. N. Wilson, K. J. A. Franke, B. M. Huddart, A. Štefančič, S. J. R. Holt, G. Balakrishnan, D. A. Mayoh, M. T. Birch, S. H. Moody, H. Luetkens, Z. Guguchia, M. T. F. Telling, P. J. Baker, S. J. Clark, T. Lancaster

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Abstract

Skyrmions are particlelike vortices of magnetization with nontrivial topology, which are usually stabilized by Dzyaloshinskii-Moriya interactions (DMI) in noncentrosymmetric bulk materials. Exceptions are centrosymmetric Gd- and Eu-based skyrmion-lattice (SL) hosts with zero DMI, where both the SL stabilization mechanisms and magnetic ground states remain controversial. We address these here by investigating both the static and dynamical spin properties of the centrosymmetric SL host Gd2PdSi3 using muon spectroscopy. We find that spin fluctuations in the noncoplanar SL phase are highly anisotropic, implying that spin anisotropy plays a prominent role in stabilizing this phase. We also observe strongly anisotropic spin dynamics in the ground-state (IC-1) incommensurate magnetic phase of the material, indicating that it hosts a meronlike multi-q structure. In contrast, the higher-field, coplanar IC-2 phase is found to be single q with nearly isotropic spin dynamics.

Published by the American Physical Society

2025

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中心对称Gd2PdSi3中的各向异性Skyrmion和多q自旋动力学

Skyrmions是一种具有非平凡拓扑结构的粒子状磁化涡旋，通常在非中心对称块状材料中由Dzyaloshinskii-Moriya相互作用（DMI）稳定。例外情况是中心对称的Gd和eu基skyrmion-lattice （SL）宿主具有零DMI，其中SL稳定机制和磁基态仍然存在争议。我们在这里通过使用μ子光谱研究中心对称SL宿主Gd2PdSi3的静态和动态自旋特性来解决这些问题。我们发现非共面SL相的自旋涨落具有高度的各向异性，这意味着自旋各向异性在稳定该相中起着突出的作用。我们还观察到材料基态（IC-1）不相称磁相的强各向异性自旋动力学，表明它具有类似介子的多q结构。相比之下，高场共面IC-2相为单q，具有几乎各向同性的自旋动力学。2025年由美国物理学会出版

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

Physical review letters 物理-物理：综合

CiteScore

16.50

自引率

7.00%

发文量

2673

审稿时长

2.2 months

期刊介绍： Physical review letters(PRL)covers the full range of applied, fundamental, and interdisciplinary physics research topics: General physics, including statistical and quantum mechanics and quantum information Gravitation, astrophysics, and cosmology Elementary particles and fields Nuclear physics Atomic, molecular, and optical physics Nonlinear dynamics, fluid dynamics, and classical optics Plasma and beam physics Condensed matter and materials physics Polymers, soft matter, biological, climate and interdisciplinary physics, including networks