Spin excitations near the pressure-induced antiferromagnetic transition in SrCu₂(BO₃)₂.

IF 2.8 3区材料科学 Q1 Biochemistry, Genetics and Molecular Biology

Journal of Applied Crystallography Pub Date : 2026-05-14 eCollection Date: 2026-06-01 DOI:10.1107/S1600576726003705

Jeppe Jon Cederholm, Andrea Piovano, Alexandre Ivanov, Stefan Klotz, Arno Hiess, Ursula B Hansen, Ekaterina Pomjakushina, Mohamed E Zayed, Ellen Fogh, Henrik M Rønnow

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引用次数: 0

Abstract

SrCu₂(BO₃)₂ is a frustrated quantum magnet which realizes the Shastry-Sutherland model. The system exhibits a sequence of pressure-induced phases, including a long-range antiferromagnetically ordered state. We have performed inelastic neutron scattering experiments on a single crystal at 4.2 (2) GPa, in the antiferromagnetic phase. The observed dispersive spin excitations were modeled using linear-spin-wave theory to extract exchange parameters. Our results are consistent with previously reported parameters at higher pressures and confirm the existence of a Goldstone mode as well as underlining the importance of the interlayer coupling. These results complement previous high-pressure studies and provide further input for theoretical models of SrCu₂(BO₃)₂ under extreme conditions.

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SrCu2(BO3)2中压力诱导反铁磁跃迁附近的自旋激发。

SrCu2(BO3)2是一种实现Shastry-Sutherland模型的受挫量子磁体。该体系表现出一系列压力诱导相，包括一个远程反铁磁有序态。我们在4.2 (2)GPa的反铁磁相单晶上进行了非弹性中子散射实验。利用线性自旋波理论对观测到的色散自旋激励进行建模，提取交换参数。我们的结果与先前报道的在更高压力下的参数一致，证实了Goldstone模式的存在，并强调了层间耦合的重要性。这些结果补充了之前的高压研究，并为SrCu2(BO3)2在极端条件下的理论模型提供了进一步的输入。

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

Journal of Applied Crystallography 化学-晶体学

CiteScore

10.00

自引率

3.30%

发文量

178

审稿时长

4.7 months

期刊介绍： Many research topics in condensed matter research, materials science and the life sciences make use of crystallographic methods to study crystalline and non-crystalline matter with neutrons, X-rays and electrons. Articles published in the Journal of Applied Crystallography focus on these methods and their use in identifying structural and diffusion-controlled phase transformations, structure-property relationships, structural changes of defects, interfaces and surfaces, etc. Developments of instrumentation and crystallographic apparatus, theory and interpretation, numerical analysis and other related subjects are also covered. The journal is the primary place where crystallographic computer program information is published.