Metamagnetic transitions and anomalous magnetoresistance in EuAg4As2 crystals

• 作者: QinQing Zhu Liang Li ZhiHua Yang ZheFeng Lou JianHua Du JinHu Yang Bin Chen HangDong Wang MingHu Fang
• 来源期刊: 中国科学：物理学 力学 天文学（英文版）
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: Article
• 页码范围: 91-97
• 页数: 7页
• 语种: 英文

摘要

In this work,we systematically studied the magnetic and transport properties of EuAg4As2 single crystals.It was found that the two antiferromagnetic transitions(TN1 = 10 K and TN2=15 K)were driven to lower temperatures by an applied magnetic field.Below TN1,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 TN1,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.