Influence of Ho doping on the structural and magnetic properties in Sr2-xHoxFeMoO6 double perovskite

IF 2.4 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

Solid State Communications Pub Date : 2025-10-07 DOI:10.1016/j.ssc.2025.116187

Changcai Chen , Yuan Yuan , Chaoxiang Jin , Munan Yang , Tianyong Zhang

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Abstract

We investigated the influence of Ho doping on the structural and magnetic properties in double perovskite oxide Sr_2-xHo_xFeMoO₆ (SHFMO, x = 0, 0.05, 0.1 and 0.2). All samples, prepared via conventional solid state reaction method, were confirmed by X-ray diffraction analysis to crystallize in the I4/m space group. Analysis of the superlattice peak (I₀₁₁) relative to the main peaks (I₀₂₀+I₁₁₂) revealed that antisite defects increase with Ho doping, attributed to a reduction in Fe/Mo ordering. Magnetic phase transition temperatures (T_c), determined from M-T curves, decrease progressively with increasing x: 375 K(x = 0), 326 K(x = 0.05), 313 K(x = 0.1), and 280 K(x = 0.2). The Arrot plots (H/M–M²) indicate that the magnetic transition is of second order. Under an applied magnetic field of 5 T, the maximum magnetic entropy change (|ΔS_M|) values for SHFMO samples are 0.75(x = 0), 0.89(x = 0.05), 0.93(x = 0.1) and 0.77 J kg⁻¹ K⁻¹(x = 0.2). Notably, Sr_1.9Ho_0.1FeMoO₆ exhibits the highest relative cooling power (RCP) of 37.5 J/kg. There results demonstrate that Ho doping is an effective method for tuning the structural and magnetic properties of double perovskite systems, with the x = 0.1 composition showing particular promise.

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Ho掺杂对Sr2-xHoxFeMoO6双钙钛矿结构和磁性能的影响

研究了Ho掺杂对双钙钛矿氧化物Sr2-xHoxFeMoO6 （SHFMO, x = 0,0.05, 0.1和0.2）结构和磁性能的影响。所有样品均采用常规固相反应法制备，经x射线衍射分析证实在I4/m空间群中结晶。相对于主峰（I020+I112）的超晶格峰（I011）分析表明，Ho掺杂导致反位缺陷增加，这是由于Fe/Mo有序度的降低。磁相变温度（Tc），由M-T曲线确定，随着x的增加逐渐降低：375 K(x = 0), 326 K(x = 0.05), 313 K（x = 0.1）和280 K（x = 0.2）。Arrot图（H/ M-M2）表明磁跃迁是二阶的。在5 T的外加磁场下，SHFMO样品的最大磁熵变化（|ΔSM|）值分别为0.75（x = 0）、0.89（x = 0.05）、0.93（x = 0.1）和0.77 J kg−1 K−1（x = 0.2）。Sr1.9Ho0.1FeMoO6的相对冷却功率（RCP）最高，为37.5 J/kg。结果表明，Ho掺杂是调整双钙钛矿体系结构和磁性能的有效方法，其中x = 0.1的组分表现出特别的前景。

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来源期刊

Solid State Communications 物理-物理：凝聚态物理

CiteScore

3.40

自引率

4.80%

发文量

287

审稿时长

51 days

期刊介绍： Solid State Communications is an international medium for the publication of short communications and original research articles on significant developments in condensed matter science, giving scientists immediate access to important, recently completed work. The journal publishes original experimental and theoretical research on the physical and chemical properties of solids and other condensed systems and also on their preparation. The submission of manuscripts reporting research on the basic physics of materials science and devices, as well as of state-of-the-art microstructures and nanostructures, is encouraged. A coherent quantitative treatment emphasizing new physics is expected rather than a simple accumulation of experimental data. Consistent with these aims, the short communications should be kept concise and short, usually not longer than six printed pages. The number of figures and tables should also be kept to a minimum. Solid State Communications now also welcomes original research articles without length restrictions. The Fast-Track section of Solid State Communications is the venue for very rapid publication of short communications on significant developments in condensed matter science. The goal is to offer the broad condensed matter community quick and immediate access to publish recently completed papers in research areas that are rapidly evolving and in which there are developments with great potential impact.