Metamagnetic transitions and anomalous magnetoresistance in EuAg4As2 crystals
Metamagnetic transitions and anomalous magnetoresistance in EuAg4As2 crystals
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DOI：
10.1007/s11433-020-1629-x
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发表时间：
2020-05
期刊：
影响因子：
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通讯作者：
Qinqing Zhu;Liang Li;Zhihuan Yang;Zhefeng Lou;Jianhua Du;Jinhu Yang;Bin Chen;Hangdong Wang;M. Fang
中科院分区：
文献类型：
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作者：
Qinqing Zhu;Liang Li;Zhihuan Yang;Zhefeng Lou;Jianhua Du;Jinhu Yang;Bin Chen;Hangdong Wang;M. Fang
本文系统地研究了EuAg_4As_2单晶的磁性和输运性质。结果表明，外加磁场可使两个反铁磁转变（TN_1 = 10 K和TN_2 =15 K）向低温方向移动。在TN 1以下，当磁场作用于ab平面（H//ab-平面）时，观察到两个连续的变磁转变。对于H//abandH//c，EuAg 4As 2在低于TN 1的低磁场下表现出出乎意料的大的正磁阻（高达202%），在高场/中温下表现出大的负磁阻（高达−78%），因此在磁传感器中具有潜在的应用。最后，利用电阻率和磁化强度数据，绘制了EuAg_4As_2的H//和H//的磁相图。
In this work, we systematically studied the magnetic and transport properties of EuAg4As2single crystals. It was found that the two antiferromagnetic transitions (TN1= 10 K andTN2=15 K) were driven to lower temperatures by an applied magnetic field. BelowTN1, two successive metamagnetic transitions were observed when a magnetic field was applied in theabplane (H//ab-plane). For bothH//abandH//c, EuAg4As2 showed a positive, unexpectedly large magnetoresistance (up to 202%) in lower magnetic fields belowTN1, and a large negative magnetoresistance (up to −78%) at high fields/intermediate temperatures, thus presenting potential applications in magnetic sensors. Finally, the magnetic phase diagrams of EuAg4As2were constructed for bothH//abandH//cusing the resistivity and magnetisation data.