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arXiv 2305.03087cond-mat.mtrl-sci
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4d元素诱导的结构无序改善及NiRuMnSn中弱再入自旋玻璃行为的发育

4d-element induced improvement of structural disorder and development of weakly re-entrant spin-glass behaviour in NiRuMnSn

Shuvankar Gupta, Sudip Chakraborty, Vidha Bhasin, Santanu Pakhira, Anis Biswas, Yaroslav Mudryk, Amit Kumar, Celine Barreteau, Jean-Claude Crivello, Amitabh Das… 展开作者

Shuvankar Gupta, Sudip Chakraborty, Vidha Bhasin, Santanu Pakhira, Anis Biswas, Yaroslav Mudryk, Amit Kumar, Celine Barreteau, Jean-Claude Crivello, Amitabh Das, S. N. Jha, D. Bhattacharyya, Vitalij K. Pecharsky, Eric Alleno, Chandan Mazumdar

AI总结:

本研究发现,在四元Heusler合金NiRuMnSn中,4d元素Ru的引入导致4c/4d位点50:50无序,不仅未改善半金属铁磁性,反而使自旋极化显著下降,并在~60 K以下表现出罕见的弱再入自旋玻璃行为。

摘要:

追求在通式为$XX'YZ$(其中X、$X'$和Y为过渡金属,Z为p区元素)的四元Heusler合金中实现高效自旋极化,一直是一个具有重要科学意义的课题。尽管先前的研究表明,在四元Heusler合金中用4d元素替代3d元素的等电子取代可改善半金属铁磁特性,但我们对四元Heusler合金NiRuMnSn的研究揭示了一个截然不同的情况。在本研究中,我们利用X射线吸收精细结构(EXAFS)和中子衍射(ND)技术对该材料进行了详细的结构分析,证实了单相化合物的形成,且在4c/4d位点上的Ni/Ru原子之间存在50:50的位点无序。与预期相反,我们的DFT计算表明,即使在有序结构中,自旋极化也出现显著下降。此外,我们报告了该化合物异常的行为,在$\sim$60 K以下表现出罕见的再入自旋玻璃特性,这是四元Heusler型化合物中独特且引人注目的特征。

英文摘要:

The pursuit of efficient spin-polarization in quaternary Heusler alloys with the general formula $XX'YZ$ (where X, $X'$, and Y are transition metals and Z is a p-block element), has been a subject of significant scientific interest. While previous studies shows that isoelectronic substitution of 4d element in place of 3d element in quaternary Heusler alloy, improves the half-metallic ferromagnetic characteristics, our research on the quaternary Heusler alloy NiRuMnSn reveals a strikingly different scenario. In this study, we present a detailed structural analysis of the material using X-ray absorption fine structure (EXAFS) and neutron diffraction (ND) techniques, which confirms the formation of a single-phase compound with 50:50 site disorder between Ni/Ru atoms at 4c/4d sites. Contrary to expectations, our DFT calculations suggests a considerable decrease in spin-polarization even in the ordered structure. Additionally, we report on the compound's exceptional behavior, displaying a rare re-entrant spin glass property below $\sim$60 K, a unique and intriguing feature for quaternary Heusler-type compounds.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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