Effect of Spin Fluctuation on a Frustrated Two-Dimensional Ising Antiferromagnet in Magnetic Fields

IF 1.6 4区物理与天体物理 Q3 PHYSICS, APPLIED

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-01-17 DOI:10.1007/s10948-024-06843-1

Thao Huong Pham

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Abstract

The \({J}_{1}-{J}_{2}\) frustrated two-dimensional Ising antiferromagnet in the magnetic fields on the square lattice is studied using a functional integral method. First, we determine possible ground states of the model including Néel antiferromagnetic phase and striped antiferromagnetic phase, which depend on the value of the frustrated parameter \(\alpha ={J}_{2}/{J}_{1}\). The influence of the spin fluctuations in the presence of the frustration, temperature, and longitudinal and transverse fields on these two phases is also studied, which shows the strong impact of the spin fluctuations at the phase transition points. The effects of the longitudinal and transverse fields are highlighted. In addition, we also calculate and plot the temperature dependence of the magnetic susceptibility, and we find a sharp peak related to a phase transition and a rounded peak related to the competition of the effects of the antiferromagnetic exchange couplings, temperature and fields. Hence, we suggest experimental relevance for the given theoretical model with Li₂VOSiO₄ and YbBi₂IO₄.

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自旋涨落对磁场中受挫二维Ising反铁磁体的影响

用泛函积分法研究了方形晶格上磁场中\({J}_{1}-{J}_{2}\)受挫二维伊辛反铁磁体。首先，我们确定了模型可能的基态，包括n反铁磁相和条纹反铁磁相，它们取决于受挫参数\(\alpha ={J}_{2}/{J}_{1}\)的值。研究了挫折场、温度场、纵向场和横向场存在时自旋涨落对这两个相的影响，结果表明自旋涨落对相变点的影响较大。强调了纵向场和横向场的影响。此外，我们还计算并绘制了磁化率的温度依赖性，我们发现了一个与相变有关的尖峰和一个与反铁磁交换耦合、温度和场的影响竞争有关的圆峰。因此，我们认为Li2VOSiO4和YbBi2IO4的理论模型具有实验相关性。

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来源期刊

Journal of Superconductivity and Novel Magnetism 物理-物理：凝聚态物理

CiteScore

3.70

自引率

11.10%

发文量

342

审稿时长

3.5 months

期刊介绍： The Journal of Superconductivity and Novel Magnetism serves as the international forum for the most current research and ideas in these fields. This highly acclaimed journal publishes peer-reviewed original papers, conference proceedings and invited review articles that examine all aspects of the science and technology of superconductivity, including new materials, new mechanisms, basic and technological properties, new phenomena, and small- and large-scale applications. Novel magnetism, which is expanding rapidly, is also featured in the journal. The journal focuses on such areas as spintronics, magnetic semiconductors, properties of magnetic multilayers, magnetoresistive materials and structures, magnetic oxides, etc. Novel superconducting and magnetic materials are complex compounds, and the journal publishes articles related to all aspects their study, such as sample preparation, spectroscopy and transport properties as well as various applications.