期刊
NPJ QUANTUM MATERIALS
卷 6, 期 1, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/s41535-020-00301-6
关键词
-
类别
资金
- Deutsche Forschungsgemeinschaft
- French Agence Nationale de la Recherche [316912154]
- European Research Council [617196]
- IDRIS/GENCI Orsay [t2020091393]
- Schrodinger fellowship of the Austrian Science Fund (FWF) [J-4267]
- future pioneering program MagHEM by the New Energy and Industrial Technology Development Organization (NEDO) [JPNP14015]
- computer team at CPHT
In this study, it was found that the Ce-4f shell in Ce-Fe intermetallics is partially Kondo screened, with nitrogen interstitials dramatically enhancing the Kondo scale and suppressing the Ce-4f contribution to magnetic anisotropy. Unscreened Ce-4f moments were shown to contribute little to the room-temperature intrinsic magnetic hardness.
Cerium-based intermetallics are currently attracting much interest as a possible alternative to existing high-performance magnets containing scarce heavy rare-earth elements. However, the intrinsic magnetic properties of Ce in these systems are poorly understood due to the difficulty of a quantitative description of the Kondo effect, a many-body phenomenon where conduction electrons screen out the Ce-4f moment. Here, we show that the Ce-4f shell in Ce-Fe intermetallics is partially Kondo screened. The Kondo scale is dramatically enhanced by nitrogen interstitials suppressing the Ce-4f contribution to the magnetic anisotropy, in striking contrast to the effect of nitrogenation in isostructural intermetallics containing other rare-earth elements. We determine the full temperature dependence of the Ce-4f single-ion anisotropy and show that even unscreened Ce-4f moments contribute little to the room-temperature intrinsic magnetic hardness. Our study thus establishes fundamental constraints on the potential of cerium-based permanent magnet intermetallics.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据