具有Co-烧绿石晶格的位有序立方Laves相化合物LuInCo$_4$中的异常强铁磁性
Unusual strong ferromagnetism in site-ordered cubic Laves phase compound LuInCo$_4$ with Co-pyrochlore lattice
AI总结：
本研究首次合成具有Co-烧绿石亚晶格的立方Laves相化合物LuInCo$_4$单晶，发现其在306K发生强铁磁转变，DFT计算揭示Co-3d平带诱导自旋极化，证明其是一种新型异常的巡游电子铁磁体。
摘要：
我们首次成功合成了具有Co-烧绿石亚晶格的位有序立方(C15b) Laves相化合物LuInCo$_4$的单晶。LuInCo$_4$在306 K发生铁磁转变，并在5 K时具有3.43 $μ_{\rm{B}}$/f.u.的饱和磁矩。DFT计算验证了其强铁磁性质，表明费米能级附近的Co-3$d$平带诱导了自旋极化。磁化率在$\sim$100 K以上各向同性，在低温下沿[100]方向最易饱和。在此各向异性铁磁态中，磁化强度沿[111]方向发生变磁转变。结果表明，LuInCo$_4$是一种新型且异常的巡游电子铁磁体，值得作为烧绿石金属深入研究。
英文摘要：
We have successfully synthesized single crystals of the site-ordered cubic (C15b) Laves phase compound LuInCo$_4$ with the Co-pyrochlore sublattice for the first time. LuInCo$_4$ undergoes a ferromagnetic transition at 306 K and has a saturation moment of 3.43 $μ_{\rm{B}}$/f.u. at 5 K. The strongly ferromagnetic nature was verified by DFT calculations, suggesting that Co-3$d$ flat bands near the Fermi level induce the spin polarization. The magnetization is isotropic above $\sim$100 K, saturates most easily in the [100] direction at low temperatures. In this anisotropic ferromagnetic state, the magnetization undergoes a metamagnetic transition in the [111] direction. Our results suggest that LuInCo$_4$ is a new strong but unusual itinerant electron ferromagnet, which deserves further study as a pyrochlore metal.
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