电子自旋共振探测 Sr2IrO4 的 Dzyaloshinsky-Moriya 相互作用诱导的反常 g 行为

IF 2.6 4区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Magnetochemistry Pub Date : 2023-11-19 DOI:10.3390/magnetochemistry9110231

Kai Wang, Liqin Yan, Youguo Shi, Baogen Shen, Lunhua He, Fangwei Wang, Jun Lu, Tongyun Zhao, Zunming Lu

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引用次数: 0

摘要

在 5d 过渡金属铱酸盐中，具有层状铬化结构的 Sr2IrO4 因其强自旋轨道耦合（SOC）而备受关注，SOC 可产生莫特绝缘态和反常物理行为。本文通过电子自旋共振（ESR）测量研究了 Sr2IrO4 的微观磁性。与典型的铁磁体相比，Sr2IrO4 铁磁共振信号的兰德因子 g 显示出异常行为。它随着温度的降低而逐渐减小，相应的共振场 Hr 也随之增大。我们详细分析了各种物理参数，包括由 M-H、Hr、ΔHpp 得出的饱和磁场 Hs，以及从 ESR 光谱中提取的 g 因子和强度 I。最终发现 g 因子的反常行为是由面内 Dzyaloshinsky-Moriya 相互作用 (DMI) 而不是 SOC 效应引起的。

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Dzyaloshinsky–Moriya Interaction Induced Anomalous g Behavior of Sr2IrO4 Probed by Electron Spin Resonance

Among the 5d transition metal iridates, Sr2IrO4, which has a layered chalcogenide structure, has received much attention due to its strong spin–orbit coupling (SOC), which produces Mott insulating states and anomalous physical behaviors. In this paper, the microscopic magnetism of Sr2IrO4 is studied with electron spin resonance (ESR) measurements. The Lande factor g of the ferromagnetic resonance signal of Sr2IrO4 shows anomalous behavior compared to typical ferromagnets. It gradually decreases, and the corresponding resonance field Hr increases, with decreasing temperature. The various physical parameters. including the saturated magnetic field Hs derived from M-H, Hr, ΔHpp, the g factor and the intensity I extracted from ESR spectra, are analyzed in detail. Eventually, it is revealed that the anomalous behavior of the g-factor is induced by in-plane Dzyaloshinsky–Moriya interaction (DMI) rather than the SOC effect.

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来源期刊

Magnetochemistry Chemistry-Chemistry (miscellaneous)

CiteScore

3.90

自引率

11.10%

发文量

145

审稿时长

11 weeks

期刊介绍： Magnetochemistry (ISSN 2312-7481) is a unique international, scientific open access journal on molecular magnetism, the relationship between chemical structure and magnetism and magnetic materials. Magnetochemistry publishes research articles, short communications and reviews. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.