| Autor: |
Zhu, Qinqing, Li, Liang, Yang, Zhihua, Lou, Zhefeng, Du, Jianhua, Yang, Jinhu, Chen, Bin, Wang, Hangdong, Fang, Minghu |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
SCIENCE CHINA Physics, Mechanics & Astronomy Vol. 64 No. 2: 227011 (2021) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1007/s11433-020-1629-x |
| Popis: |
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 $\textit{H}$ $\parallel$ $\textit{c}$. |
| Databáze: |
arXiv |
| Externí odkaz: |
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