论文标题
euag $ _4 $ as $ _2 $单晶的元磁过渡和异常磁静脉
Metamagnetic transitions and anomalous magnetoresistance in EuAg$_4$As$_2$ single crystal
论文作者
论文摘要
在本文中，对Euag $ _4 $的磁性和传输属性进行了系统的研究，为$ _2 $单晶，以中心对称的三角形CACU $ _4 $ P $ _2 $类型结构结晶。已经确认，在$ \ textit {t} $$ _ {n1} $ = 10 K和$ \ textit {t} $$ _ {n2} $ = 15 k分别发生了两个磁过渡。随着场的增加，这两个过渡被明显驱动到较低的温度。在低温下，在$ \ textit {ab} $平面中应用磁场可引起两个连续的元磁过渡。 For both $\textit{H}$ $\parallel$ $\textit{ab}$ and $\textit{H}$ $\parallel$ $\textit{c}$, EuAg$_4$As$_2$ shows a positive, unexpected large magnetoresistance (up to 202\%) at low fields below 10 K, and a large negative magnetoresistance (up to -78 \％）在高场/中等温度下。这种磁倍率的这种异常场依赖性可能在未来的磁传感器中具有潜在的应用。最后，为$ _ {2} $的euag $ _ {4} $的磁相图均已为$ \ textIt {h} $ $ \ $ \ parallel $ $ $ $ \ textit {ab} $和$ \ textit {h} $ \ textit {h} $ $ $ $ \ $ \ parallel $ $ $ $ \ textit {c} $构建。
In this paper, the magnetic and transport properties were systematically studied for EuAg$_4$As$_2$ single crystals, crystallizing in a centrosymmetric trigonal CaCu$_4$P$_2$ type structure. It was confirmed that two magnetic transitions occur at $\textit{T}$$_{N1}$ = 10 K and $\textit{T}$$_{N2}$ = 15 K, respectively. With the increasing field, the two transitions are noticeably driven to lower temperature. At low temperatures, applying a magnetic field in the $\textit{ab}$ plane induces two successive metamagnetic transitions. For both $\textit{H}$ $\parallel$ $\textit{ab}$ and $\textit{H}$ $\parallel$ $\textit{c}$, EuAg$_4$As$_2$ shows a positive, unexpected large magnetoresistance (up to 202\%) at low fields below 10 K, and a large negative magnetoresistance (up to -78\%) at high fields/intermediate temperatures. Such anomalous field dependence of magnetoresistance may have potential application in the future magnetic sensors. Finally, the magnetic phase diagrams of EuAg$_{4}$As$_{2}$ were constructed for both $\textit{H}$ $\parallel$ $\textit{ab}$ and $\textit{H}$ $\parallel$ $\textit{c}$.
