In this work, we systematically studied the magnetic and transport properties of EuAg₄As₂ single crystals. It was found that the two antiferromagnetic transitions (T_N1 = 10 K and T_N2=15 K) were driven to lower temperatures by an applied magnetic field. Below T_N1, two successive metamagnetic transitions were observed when a magnetic field was applied in the ab plane (H//ab-plane). For both H//ab and H//c, EuAg4As2 showed a positive, unexpectedly large magnetoresistance (up to 202%) in lower magnetic fields below T_N1, 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 EuAg₄As₂ were constructed for both H//ab and H//c using the resistivity and magnetisation data.

在这项工作中，我们系统地研究了EuAg ₄ As ₂单晶的磁性和输运性质。结果发现，这两个反铁磁转变（Ť _{Ñ 1} = 10 K和Ť _{Ñ 2} = 15 K）被驱动通过所施加的磁场降低的温度。在T _{N 1}以下，当在ab平面（H // ab平面）中施加磁场时，观察到两个连续的亚磁跃迁。对于H // ab和H // c，EuAg4As2在低于T的较低磁场中显示出正的，出乎意料的大磁阻（高达202％）_{N 1}，在高磁场/中温下具有较大的负磁阻（高达-78％），因​​此在磁传感器中具有潜在的应用前景。最后，使用电阻率和磁化数据为H // ab和H // c构造EuAg ₄ As ₂的磁相图。