Pal Koustav, Dey Suman, Das I
Saha Institute of Nuclear Physics, A CI of Homi Bhabha National Institute, Kolkata 700064, India.
J Phys Condens Matter. 2024 Feb 27;36(21). doi: 10.1088/1361-648X/ad2aac.
The magnetic properties of orthorhombic aluminides have recently been the subject of investigation, revealing several intriguing phenomena within this class of materials. However, the exploration of their magnetic and electrical transport phenomena has remained somewhat limited. In this study, we delve into the magnetic and electrical transport characteristics of one such material from that group which is DyFeAl(DFA). Our findings go beyond classifying this material as a simple antiferromagnet; but it posses a short range ferromagnetic ordering apart from helical spin structure of Dy. It exhibits a metamagnetic transition and spin glass behavior below its Néel temperature (T). Our analysis of electrical magnetotransport behavior indicates the emergence of an antiferromagnetic superzone gap, resulting in a significant enhancement in magnetoresistance effect. This discovery paves the way for a class of materials with complex interactions and notable magnetoresistance properties.
正交铝化物的磁性最近成为研究的主题，揭示了这类材料中的几个有趣现象。然而，对其磁和电输运现象的探索仍然有些有限。在本研究中，我们深入研究了该组中的一种此类材料DyFeAl（DFA）的磁和电输运特性。我们的发现不仅仅将这种材料归类为简单的反铁磁体；除了Dy的螺旋自旋结构外，它还具有短程铁磁有序。它在奈尔温度（T）以下表现出亚磁转变和自旋玻璃行为。我们对电磁输运行为的分析表明出现了反铁磁超区隙，导致磁阻效应显著增强。这一发现为一类具有复杂相互作用和显著磁阻特性的材料铺平了道路。
