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 

机构地区：[1]Hangzhou Key Laboratory of Quantum Matter,Department of Physics,Hangzhou Normal University,Hangzhou,311121,China [2]Department of Physics,Zhejiang University,Hangzhou,310027,China [3]Department of Physics,China Jiliang University,Hangzhou,310018,China [4]Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing,210093,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2021年第2期91-97,共7页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the Ministry of Science and Technology of China(Grant No.2016YFA0300402);the National Natural Science Foundation of China(Grant Nos.11974095,and 12074335);the Zhejiang Natural Science Foundation(Grant No.LY16A040012);the Fundamental Research Funds for the Central Universities。

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//abplane).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.

关 键 词：anomalous magnetoresistance metamagnetic transition magnetic phase diagram 

分 类 号：O737[理学—晶体学]