标题： MAX相化合物Cr$_{1.9}$Fe$_{0.1}$GeC中的弱巡游铁磁性（WIFM） 显示英文标题

标题： Weak Itinerant Ferromagnetism (WIFM) in MAX phase compound Cr$_{1.9}$Fe$_{0.1}$GeC

摘要： 磁性 MAX 相化合物由于具有层状晶体结构，是研究二维磁性的理想材料。 六方 MAX 相化合物 Cr$_2$GeC 是一种 Pauli 顺磁体，我们在此报告通过在 Cr 位掺杂 Fe 诱导出有序磁态的研究成果。 发现对于小掺杂浓度（分别标记为 5% 和 2.5%）诱导的磁性具有弱的巡游铁磁特性。 Rhodes-Wohlfarth 比值被测定为 13.29，而电子热容系数 ($\Gamma$) 对于 Cr$_{1.9}$Fe$_{0.1}$GeC 为 27 mJ·mol$^{-1}$K$^{-2}$。 我们的 X 射线磁圆二色测量证实磁矩仅来源于 Fe 原子，而 Cr 对有序磁矩几乎没有贡献。 我们的关键分析表明，Cr$_{1.9}$Fe$_{0.1}$GeC中的磁相变遵循平均场理论。 显示英文摘要

摘要： Magnetic MAX phase compounds are important materials for studying the two-dimensional magnetism because of their layered crystallographic structure. The hexagonal MAX phase compound Cr$_2$GeC is a Pauli paramagnet, and here we report the induction of an ordered magnetic state by doping Fe at the Cr site. Induced magnetism for small doping concentrations (indicated as 5% and 2.5%) is found to have a weak itinerant ferromagnetic character. The Rhodes-Wolhfarth ratio is found to be 13.29, while the coefficient of electronic heat capacity ($\Gamma$) is 27 mJ-mol$^{-1}$K$^{-2}$ for Cr$_{1.9}$Fe$_{0.1}$GeC. Our x-ray magnetic circular dichorism measurement confirms that the magnetic moment arises from the Fe atom only, and Cr has negligible contribution towards the ordered moment. Our critical analysis indicates that the magnetic phase transition in Cr$_{1.9}$Fe$_{0.1}$GeC follows mean field theory.