Helical spin dynamics in Cu₂OSeO₃ as measured with small-angle neutron scattering.

IF 2.3 2区物理与天体物理 Q3 CHEMISTRY, PHYSICAL

Structural Dynamics-Us Pub Date : 2025-07-18 eCollection Date: 2025-07-01 DOI:10.1063/4.0000305

Victor Ukleev, Priya R Baral, Robert Cubitt, Nina-Juliane Steinke, Arnaud Magrez, Oleg I Utesov

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引用次数: 0

Abstract

The insulating chiral magnet Cu₂OSeO₃ exhibits a rich array of low-temperature magnetic phenomena, making it a prime candidate for the study of its spin dynamics. Using spin wave small-angle neutron scattering (SWSANS), we systematically investigated the temperature-dependent behavior of the helimagnon excitations in the field-polarized phase of Cu₂OSeO₃. Our measurements, spanning 5-55 K, reveal the temperature evolution of spin-wave stiffness and damping constant with unprecedented resolution, facilitated by the insulating nature of Cu₂OSeO₃. These findings align with theoretical predictions and resolve discrepancies observed in previous studies, emphasizing the enhanced sensitivity of the SWSANS method. The results provide deeper insights into the fundamental magnetic properties of Cu₂OSeO₃, contributing to a broader understanding of chiral magnets.

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用小角中子散射测量Cu2OSeO3的螺旋自旋动力学。

绝缘手性磁体Cu2OSeO3表现出丰富的低温磁现象，使其成为研究其自旋动力学的主要候选者。利用自旋波小角中子散射（SWSANS）技术，系统地研究了Cu2OSeO3场极化相中helimagnon激发的温度依赖行为。我们的测量跨越5-55 K，以前所未有的分辨率揭示了自旋波刚度和阻尼常数的温度演变，这得益于Cu2OSeO3的绝缘特性。这些发现与理论预测一致，解决了先前研究中观察到的差异，强调了SWSANS方法的灵敏度提高。这些结果为Cu2OSeO3的基本磁性提供了更深入的见解，有助于更广泛地了解手性磁体。

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

Structural Dynamics-Us CHEMISTRY, PHYSICALPHYSICS, ATOMIC, MOLECU-PHYSICS, ATOMIC, MOLECULAR & CHEMICAL

CiteScore

5.50

自引率

3.60%

发文量

审稿时长

16 weeks

期刊介绍： Structural Dynamics focuses on the recent developments in experimental and theoretical methods and techniques that allow a visualization of the electronic and geometric structural changes in real time of chemical, biological, and condensed-matter systems. The community of scientists and engineers working on structural dynamics in such diverse systems often use similar instrumentation and methods. The journal welcomes articles dealing with fundamental problems of electronic and structural dynamics that are tackled by new methods, such as: Time-resolved X-ray and electron diffraction and scattering, Coherent diffractive imaging, Time-resolved X-ray spectroscopies (absorption, emission, resonant inelastic scattering, etc.), Time-resolved electron energy loss spectroscopy (EELS) and electron microscopy, Time-resolved photoelectron spectroscopies (UPS, XPS, ARPES, etc.), Multidimensional spectroscopies in the infrared, the visible and the ultraviolet, Nonlinear spectroscopies in the VUV, the soft and the hard X-ray domains, Theory and computational methods and algorithms for the analysis and description of structuraldynamics and their associated experimental signals. These new methods are enabled by new instrumentation, such as: X-ray free electron lasers, which provide flux, coherence, and time resolution, New sources of ultrashort electron pulses, New sources of ultrashort vacuum ultraviolet (VUV) to hard X-ray pulses, such as high-harmonic generation (HHG) sources or plasma-based sources, New sources of ultrashort infrared and terahertz (THz) radiation, New detectors for X-rays and electrons, New sample handling and delivery schemes, New computational capabilities.