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Metamagnetic transitions and anomalous magnetoresistance in EuAg4As2 crystals

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Abstract

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.

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Author notes

  1. These authors contributed equally to this work.

Authors and Affiliations

  1. Hangzhou Key Laboratory of Quantum Matter, Department of Physics, Hangzhou Normal University, Hangzhou, 311121, China

    QinQing Zhu, Liang Li, ZhiHua Yang, JinHu Yang, Bin Chen & HangDong Wang

  2. Department of Physics, Zhejiang University, Hangzhou, 310027, China

    ZheFeng Lou & MingHu Fang

  3. Department of Physics, China Jiliang University, Hangzhou, 310018, China

    JianHua Du

  4. Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China

    MingHu Fang

Authors
  1. QinQing Zhu
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  2. Liang Li
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  3. ZhiHua Yang
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  4. ZheFeng Lou
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  5. JianHua Du
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  6. JinHu Yang
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  7. Bin Chen
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  8. HangDong Wang
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  9. MingHu Fang
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Corresponding authors

Correspondence to HangDong Wang or MingHu Fang.

Additional information

This work was 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), and the Fundamental Research Funds for the Central Universities.

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Zhu, Q., Li, L., Yang, Z. et al. Metamagnetic transitions and anomalous magnetoresistance in EuAg4As2 crystals. Sci. China Phys. Mech. Astron. 64, 227011 (2021). https://doi.org/10.1007/s11433-020-1629-x

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