EuFe（2-x）Ni（x）As2中3d-4f自旋相互作用的~（57）Fe和~（151）Eu穆斯堡尔谱研究
57Fe and 151Eu Mössbauer studies of 3d-4f spin interplay in EuFe(2-x)Ni(x)As2
摘要：
用~（57）Fe和~（151）Eu穆斯堡尔谱研究了EuFe（2-x）Ni（x）As_2化合物的3d和/或4f磁序。此外，该系统，即EuFe 2As 2和EuNi 2As 2的末端成员的结果进行了报告，以供比较。结果发现，自旋密度波顺序的Fe巡游矩是单调抑制Ni取代。然而，3d磁序在最低温度至少x = 0.12时仍然存在，并且在x = 0.20时肯定完全被抑制。无论Ni浓度如何，Eu局域化矩都是有序的，但随着x的增加，Eu局域化矩会发生自旋重取向，从平行于母体化合物中的a轴排列，向c轴排列（x > 0.07）。4f自旋序从反铁磁到铁磁的变化与3d自旋序的消失同时发生，这是Eu 2+离子的磁性与[Fe（2-x）Ni（x）As 2]2-层的传导电子之间强耦合的证据。当Ni取代量x > 0.04时，由于Eu ~（2+）的有序性，Fe核受到超精细磁场的转移，而EuFe_2As_2和低Ni取代量的化合物中没有检测到超精细磁场的转移。这似乎是由于Eu 2+磁矩向晶体学c轴倾斜而产生的4f铁磁分量导致Fe原子处的转移磁场。
英文摘要：
The EuFe(2-x)Ni(x)As2 compounds exhibiting 3d and/or 4f magnetic order were investigated by means of 57Fe and 151Eu Mössbauer spectroscopy. Additionally, results for the end members of this system, i.e. EuFe2As2 and EuNi2As2, are reported for comparison. It was found that spin-density-wave order of the Fe itinerant moments is monotonically suppressed by Ni-substitution. However, the 3d magnetic order survives at the lowest temperature up to at least x = 0.12 and it is certainly completely suppressed for x = 0.20. The Eu localized moments order regardless of the Ni concentration, but undergo a spin reorientation with increasing x from the alignment parallel to the a-axis in the parent compound, toward c-axis alignment for x > 0.07. The change of the 4f spins ordering from antiferromagnetic to ferromagnetic takes place simultaneously with a disappearance of the 3d spins order what is the evidence of a strong coupling between magnetism of Eu2+ ions and the conduction electrons of [Fe(2-x)Ni(x)As2]2- layers. The Fe nuclei experience the transferred hyperfine magnetic field due to the Eu2+ ordering for Ni-substituted samples with x > 0.04, while the transferred field is undetectable in EuFe2As2 and for compound with a low Ni-substitution level. It seems that the 4f ferromagnetic component arising from a tilt of the Eu2+ moments to the crystallographic c-axis leads to the transferred magnetic field at the Fe atoms.
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