论文标题
nb $ _ {1-y} $ fe $ _ {2+y} $上的MUON自旋旋转和放松研究
Muon spin rotation and relaxation study on Nb$_{1-y}$Fe$_{2+y}$
论文作者
论文摘要
我们介绍了使用MUON自旋旋转和放松（$μ$ $ sr）的弱铁磁/量子临界NB $ _ {1-y} $ fe $ _ {2+y} $的磁性特性的详细研究。通过对磁磁状态的单晶施加的磁场中的MUON自旋旋转信号的角度依赖性研究，我们在NBFE $ _2 $的晶体学晶格中建立了MUON停止位点。有了这些知识，我们开发了模型来描述弱铁磁，旋转密度波和NB $ _ {1-y} $ fe $ _ {2+y} $的旋转旋转和松弛信号，并适合相应的实验数据。特别是，我们量化了NB $ _ {1.0117} $ Fe $ _ {1.9883} $的量子临界行为的$μ$ SR响应，并提取残留弱结构障碍的影响。从我们的分析中，NB $ _ {1-y} $ fe $ _ {2+y} $出现了非常适合研究接近弱巡回的铁磁秩序的量子关键。
We present a detailed study of the magnetic properties of weakly ferromagnetic/quantum critical Nb$_{1-y}$Fe$_{2+y}$ using muon spin rotation and relaxation ($μ$SR). By means of an angular dependent study of the muon spin rotation signal in applied magnetic fields on a single crystal in the paramagnetic state we establish the muon stopping site in the crystallographic lattice of NbFe$_2$. With this knowledge we develop models to describe the muon spin rotation and relaxation signals in the weakly ferromagnetic, spin density wave and quantum critical phases of Nb$_{1-y}$Fe$_{2+y}$ and fit the corresponding experimental data. In particular, we quantify the $μ$SR response for quantum critical behavior in Nb$_{1.0117}$Fe$_{1.9883}$ and extract the influence of residual weak structural disorder. From our analysis, Nb$_{1-y}$Fe$_{2+y}$ emerges to be uniquely suited to study quantum criticality close to weak itinerant ferromagnetic order.
