AI 中文总结
研究揭示新范德华材料(Fe₀.₆₅Co₀.₃₅)₄GeTe₂的高温反铁磁有序源于层选择性Fe-Co有序及Co 3d态巡游-局域二重性，该材料可用于反铁磁自旋电子学。
AI 中文摘要
尽管具有高奈尔温度（TN）的范德华（vdW）巡游反铁磁体对于自旋电子学极具吸引力，但这类材料仍相对稀缺。本文中，我们揭示了新发现的范德华化合物(Fe₀.₆₅Co₀.₃₅)₄GeTe₂中异常高的奈尔温度（TN=250 K）的物理起源。在Fe₄GeTe₂中掺杂Co会诱导层选择性Fe-Co有序排列，并稳定主要由Co磁矩驱动的强反铁磁（AFM）态。费米能级处类局域化Co 3d态的电子关联增强，进一步强化了反铁磁有序，产生3d电子的巡游-局域二重性。这种相互作用在远高于TN时产生强磁关联，并稳定具有非平凡贝里曲率的低温自旋倾斜。我们的结果表明，(Fe₀.₆₅Co₀.₃₅)₄GeTe₂是一种罕见的材料，可将基础磁相互作用与反铁磁自旋电子学的潜在应用联系起来。
英文摘要
While Van der Waals (vdW) itinerant antiferromagnets with high Neel temperatures (TN) are highly desirable for spintronics, they remain relatively scarce. Here, we unravel the physical origin of the unusually high TN (= 250 K) in the newly identified vdW compound (Fe0.65Co0.35)4GeTe2. The substitution of Co in Fe4GeTe2 induces layer-selective Fe-Co ordering and stabilizes a robust antiferromagnetic (AFM) state primarily driven by Co moments. The AFM order is further strengthened by enhanced electronic correlations of quasi-localized Co 3d-states at the Fermi level, giving rise to an itinerant-localized duality of the 3d electrons. This interplay generates strong magnetic correlations well above TN and stabilizes low-temperature spin canting with a possible nontrivial Berry curvature. Our results establish (Fe0.65Co0.35)4GeTe2 as a rare material bridging fundamental magnetic interactions with potential applications in AFM spintronics.
