论文标题
SMS中的非磁性磁性过渡和磁有序结构
Nonmagnetic-magnetic transition and magnetically ordered structure in SmS
论文作者
论文摘要
SMS是一种典型的中级价化合物，已经通过对$^{33} $ s-富集样品进行高压核磁共振测量来研究。在非磁性磁性过渡压力上方的15-20 K以下的其他信号的观察$ p _ {\ rm c2} \大约2 $ gpa提供了磁过渡的证据。在$ p _ {\ rm c2} $接近$ p _ {\ rm c2} $的骑士移位中缺少居里学期，表明$ 4F $电子的本地化特征已完全筛选，并且在简单的本地化模型中未描述磁性排序的机制。同时，磁序状态中的线形与旋转密度波顺序不相容。这些表明，SMS中的磁顺序可能需要超出常规框架以外的沉重费米子的理解。从订单矩中取消的超细磁场在S站点取消的事实使我们得出一个结论，即有序阶段具有II型抗磁力结构。
SmS, a prototypical intermediate valence compound, has been studied by performing high-pressure nuclear magnetic resonance measurements on a $^{33}$S-enriched sample. The observation of an additional signal below 15-20 K above a nonmagnetic-magnetic transition pressure $P_{\rm c2} \approx 2$ GPa gives evidence of a magnetic transition. The absence of a Curie-term in the Knight shift near $P_{\rm c2}$ indicates that the localized character of $4f$ electrons is entirely screened and the mechanism of the magnetic ordering is not described within a simple localized model. Simultaneously, the line shape in the magnetically ordered state is incompatible with a spin density wave order. These suggest that the magnetic order in SmS may require an understanding beyond the conventional framework for heavy fermions. The fact that hyperfine fields from the ordered moments cancel out at the S site leads us to a conclusion that the ordered phase has a type II antiferromagnetic structure.
