The chiral helimagnet Cr_1/3NbS₂ hosts exotic spin textures, whose influence on the magneto-transport properties make this material an ideal candidate for future spintronic applications. To date, the interplay between macroscopic magnetic and transport degrees of freedom is believed to result from a reduction in carrier scattering following spin order. Here, we present electronic structure measurements across the helimagnetic transition temperature T_C that challenges this view. We show that the Fermi surface is comprised of strongly hybridized Nb- and Cr-derived electronic states, and that spectral weight close to the Fermi level increases anomalously as the temperature is lowered below T_C. These findings are rationalized on the basis of first principle density functional theory calculations, which reveal a large nearest-neighbor exchange energy, suggesting the interaction between local spin moments and hybridized Nb- and Cr-derived itinerant states to go beyond the perturbative interaction of Ruderman-Kittel-Kasuya-Yosida, suggesting instead a mechanism rooted in a Hund’s exchange interaction.

手性Hel磁铁Cr _1/3 NbS _2具有奇异的自旋结构，其对磁传输性能的影响使该材料成为未来自旋电子学应用的理想选择。迄今为止，据信宏观磁自由度和传输自由度之间的相互作用是由于自旋顺次后载流子散射的减少而引起的。在这里，我们提出了跨越该磁转变温度T _C的电子结构测量结果，这对这一观点提出了挑战。我们表明费米表面由强烈杂交的Nb和Cr衍生的电子态组成，并且随着温度降低到T _C以下，接近费米能级的光谱权重反常增加。。这些发现在第一原理密度泛函理论计算的基础上得到了合理化，该计算揭示了一个很大的近邻交换能量，这表明局部自旋矩与杂化的Nb和Cr衍生的迭代态之间的相互作用超出了Ruderman的微扰相互作用。 -Kittel-Kasuya-Yosida，暗示了一种根源于洪德的交流互动的机制。