磁阻Gd2GaSbO7和Gd2InSbO7焦绿石的量子涨落迹象

IF 2.5 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials Pub Date : 2025-04-20 DOI:10.1016/j.jmmm.2025.173088

Nallamuthu Sengodan , Andrea Dzubinska , K. Arun , A.R. Vimaljith , R. Nagalakshmi , Ivan Čurlik , Sergej Iľkovič , Marian Reiffers

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引用次数: 0

摘要

研究了Gd2GaSbO7 （GGSO）和Gd2InSbO7 （GISO）焦绿盐化合物作为自旋冰态量子涨落的潜在候选物。这些材料，较少探索磁挫折，合成和结构通过x射线衍射证实。磁性和热容量测量结果显示，在400 mK以下没有长程顺序。低温磁性热容量在GGSO和GISO分别在Tmax = 0.9 K和Tmax = 1 K附近显示出广泛的最大值，并具有幂律相关性，屈服指数为Cmag≈Td/n， GGSO和GISO分别为T1.71和T1.49，表明低温下的自旋涨落。GGSO和GISO保留了类似于水冰的残余熵，表明了自旋冰的行为。值得注意的是，GISO在gd基焦绿石中具有最弱的交换相互作用，这可能受到化学压力和交换途径的影响。这些发现突出了显著的自旋涨落和潜在的量子效应，与其他gd -焦绿石的长程有序形成对比，并与Pr2Zr2O7和Yb2GaSbO7等量子自旋冰候选者一致。

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Indications of quantum fluctuations in magnetically frustrated Gd2GaSbO7 and Gd2InSbO7 pyrochlores

Gd₂GaSbO₇ (GGSO) and Gd₂InSbO₇ (GISO) pyrochlore compounds are investigated as potential candidates for exhibiting quantum fluctuations in a spin-ice-like state. These materials, less explored in magnetic frustration, were synthesized and structurally confirmed via X-ray diffraction. Magnetic and heat capacity measurements revealed no long-range order down to 400 mK. The low-temperature magnetic heat capacity shows broad maxima around T_max = 0.9 K and T_max = 1 K for GGSO and GISO respectively, with power-law dependence

(C_{mag} \approx T^{d / n})

yielding exponents, T^1.71 for GGSO and T^1.49 for GISO, indicating spin fluctuations at low temperatures. GGSO and GISO retain residual entropy akin to water ice, indicative of spin-ice behavior. Notably, GISO has the weakest exchange interaction among Gd-based pyrochlores, which may be influenced by chemical pressure and exchange pathways. These findings highlight significant spin fluctuations and potential quantum effects, contrasting with long-range order in other Gd-pyrochlores and aligning with quantum spin-ice candidates like Pr₂Zr₂O₇ and Yb₂GaSbO₇.

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来源期刊

Journal of Magnetism and Magnetic Materials 物理-材料科学：综合

CiteScore

5.30

自引率

11.10%

发文量

1149

审稿时长

59 days

期刊介绍： The Journal of Magnetism and Magnetic Materials provides an important forum for the disclosure and discussion of original contributions covering the whole spectrum of topics, from basic magnetism to the technology and applications of magnetic materials. The journal encourages greater interaction between the basic and applied sub-disciplines of magnetism with comprehensive review articles, in addition to full-length contributions. In addition, other categories of contributions are welcome, including Critical Focused issues, Current Perspectives and Outreach to the General Public. Main Categories: Full-length articles: Technically original research documents that report results of value to the communities that comprise the journal audience. The link between chemical, structural and microstructural properties on the one hand and magnetic properties on the other hand are encouraged. In addition to general topics covering all areas of magnetism and magnetic materials, the full-length articles also include three sub-sections, focusing on Nanomagnetism, Spintronics and Applications. The sub-section on Nanomagnetism contains articles on magnetic nanoparticles, nanowires, thin films, 2D materials and other nanoscale magnetic materials and their applications. The sub-section on Spintronics contains articles on magnetoresistance, magnetoimpedance, magneto-optical phenomena, Micro-Electro-Mechanical Systems (MEMS), and other topics related to spin current control and magneto-transport phenomena. The sub-section on Applications display papers that focus on applications of magnetic materials. The applications need to show a connection to magnetism. Review articles: Review articles organize, clarify, and summarize existing major works in the areas covered by the Journal and provide comprehensive citations to the full spectrum of relevant literature.