极子在 Eu5In2Sb6 反铁磁阶内稳定的热力学证据

IF 7.5 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Communications Materials Pub Date : 2024-11-08 DOI:10.1038/s43246-024-00689-9
Hubert Dawczak-Dębicki, M. Victoria Ale Crivillero, Matthew S. Cook, Sean M. Thomas, Priscila F. S. Rosa, Jens Müller, Ulrich K. Rößler, Pedro Schlottmann, Steffen Wirth
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引用次数: 0

摘要

在纳米尺度上表现出电子不均匀性的材料具有巨大的应用潜力。磁极子就是这样一种不均匀性,它将相关物质中的电子自由度、磁性自由度和晶格自由度联系在一起,通常会产生巨大的磁阻。在这里,我们通过沿不同晶体学方向的热膨胀和磁致伸缩来研究 Eu5In2Sb6 单晶体。这些数据为远高于磁有序温度的 Eu5In2Sb6 中磁极子的形成提供了令人信服的证据。更具体地说,我们的结果与沿不同晶体学方向形成的程度各异的各向异性磁极子是一致的。在磁有序相中发现的交叉可能与温度降低时全球反铁磁有序中铁磁极子的惊人稳定有关。这些发现使 Eu5In2Sb6 成为这种磁有序共存和竞争的罕见实例,更重要的是,它为锰酸盐以外的巨磁阻行为提供了新的启示。在纳米尺度上表现出电子不均匀性(如磁极子)的材料具有磁阻应用的巨大潜力。在这里,对 Eu5In2Sb6 单晶体进行的热膨胀和磁致伸缩测量揭示了磁极子的形成远高于磁有序温度,为锰酸盐以外的巨大磁阻行为提供了启示。
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Thermodynamic evidence for polaron stabilization inside the antiferromagnetic order of Eu5In2Sb6
Materials exhibiting electronic inhomogeneities at the nanometer scale have enormous potential for applications. Magnetic polarons are one such type of inhomogeneity which link the electronic, magnetic and lattice degrees of freedom in correlated matter and often give rise to colossal magnetoresistance. Here, we investigate single crystals of Eu5In2Sb6 by thermal expansion and magnetostriction along different crystallographic directions. These data provide compelling evidence for the formation of magnetic polarons in Eu5In2Sb6 well above the magnetic ordering temperature. More specifically, our results are consistent with anisotropic polarons with varying extent along the different crystallographic directions. A crossover revealed within the magnetically ordered phase can be associated with a surprising stabilization of ferromagnetic polarons within the global antiferromagnetic order upon decreasing temperature. These findings make Eu5In2Sb6 a rare example of such coexisting and competing magnetic orders and, importantly, shed new light on colossal magnetoresistive behavior beyond manganites. Materials exhibiting electronic inhomogeneities at the nanometer scale, such as magnetic polarons, have great potential for magnetoresistive applications. Here, thermal expansion and magnetostriction measurements on Eu5In2Sb6 single crystals reveal the formation of magnetic polarons well above the magnetic ordering temperature, providing insights on colossal magnetoresistive behavior beyond manganites.
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来源期刊
Communications Materials
Communications Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
12.10
自引率
1.30%
发文量
85
审稿时长
17 weeks
期刊介绍: Communications Materials, a selective open access journal within Nature Portfolio, is dedicated to publishing top-tier research, reviews, and commentary across all facets of materials science. The journal showcases significant advancements in specialized research areas, encompassing both fundamental and applied studies. Serving as an open access option for materials sciences, Communications Materials applies less stringent criteria for impact and significance compared to Nature-branded journals, including Nature Communications.
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