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铕锡磷单晶的磁性研究。

Studies of magnetic properties of EuSnP single crystals.

作者信息

Podgórska Karolina, Komędera Kamila, Przewoźnik Janusz, Gondek Łukasz, Kapusta Czesław, Tabiś Wojciech, Babij Michał, Tran Lan Maria, Rybicki Damian

机构信息

Faculty of Physics and Applied Computer Science, AGH University of Krakow, al. A. Mickiewicza 30, 30-059, Kraków, Poland.

Institute of Low Temperature and Structure Research, ul. Okólna 2, 50-422, Wrocław, Poland.

出版信息

Sci Rep. 2025 Aug 20;15(1):30490. doi: 10.1038/s41598-025-16036-y.

DOI:10.1038/s41598-025-16036-y
PMID:40830399
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12365127/
Abstract

Europium-based compounds exhibit a wide range of intriguing properties due to the element's ability to exist in two valence states: Eu[Formula: see text], which carries a strong magnetic moment, and non-magnetic Eu[Formula: see text], as well as due to interactions between localized f-electrons and conduction electrons. In this work, we present a comprehensive study of EuSnP single crystals using X-ray diffraction, heat capacity, dc and ac magnetic susceptibility, magnetization, and Mössbauer spectroscopy measurements. EuSnP undergoes an antiferromagnetic transition at [Formula: see text] K. However, our results indicate that magnetic correlations emerge well above the transition temperature. Mössbauer spectroscopy revealed that Eu valence in EuSnP is 2+ contradicting earlier suggestions of its mixed-valent state. It also shows exceptionally high values of the effective magnetic field (39 T) and large electric field gradient at Eu nuclei likely due to the short distances between Eu atoms and their nearest neighbors. Based on our studies, we propose two possible magnetic ordering schemes of Eu magnetic moments. In the first one, moments are aligned ferromagnetically within each Eu-P plane and there is an antiferromagnetic coupling between Eu-P planes forming a bilayer. In the second one, there is a ferromagnetic order within the entire bilayer and neighboring bilayers are coupled antiferromagnetically. In both scenarios magnetic moments are oriented along or close to the crystallographic c-axis.

摘要

基于铕的化合物展现出一系列引人入胜的特性，这归因于该元素能够以两种价态存在：具有强磁矩的Eu[化学式：见原文]以及非磁性的Eu[化学式：见原文]，同时也归因于局域f电子与传导电子之间的相互作用。在这项工作中，我们使用X射线衍射、热容量、直流和交流磁化率、磁化强度以及穆斯堡尔谱测量对EuSnP单晶进行了全面研究。EuSnP在[化学式：见原文]K时发生反铁磁转变。然而，我们的结果表明磁关联在转变温度之上就已显著出现。穆斯堡尔谱显示EuSnP中Eu的价态为2 +，这与之前关于其混合价态的推测相矛盾。它还显示出极高的有效磁场值（39 T）以及Eu原子核处大的电场梯度，这可能是由于Eu原子与其最近邻原子之间的距离较短所致。基于我们的研究，我们提出了两种可能的Eu磁矩磁有序方案。在第一种方案中，磁矩在每个Eu - P平面内铁磁排列，并且Eu - P平面之间存在反铁磁耦合形成双层结构。在第二种方案中，整个双层结构内存在铁磁序，相邻双层结构反铁磁耦合。在这两种情况下，磁矩都沿着或接近晶体学c轴取向。

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