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SCIENCE CHINA Physics, Mechanics & Astronomy, Volume 64 , Issue 2 : 227011(2021) https://doi.org/10.1007/s11433-020-1629-x

Metamagnetic transitions and anomalous magnetoresistance in EuAg$_{4}$As$_{2}$ crystals

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  • ReceivedAug 25, 2020
  • AcceptedOct 28, 2020
  • PublishedDec 29, 2020
PACS numbers

Abstract


Acknowledgment

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.


References

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  • Figure 1

    (Color online) (a) Single crystal XRD pattern of EuAg$_{4}$As$_{2}$. Inset: photograph of a EuAg$_{4}$As$_{2}$ single crystal. (b) Crystal structure of EuAg$_{4}$As$_{2}$. Europium, silver, and arsenic atoms are drawn as purple, grey, and green spheres, respectively. (c) Temperature dependence of the magnetic susceptibility for EuAg$_{4}$As$_{2}$ measured at $\mu_0H$=0.1 T applied in the $\textit{ab}$-plane and along the $\textit{c}$-axis, respectively. The inset of the figure shows an enlarged view of the magnetic susceptibility at low temperatures.

  • Figure 2

    (Color online) Temperature dependence of magnetic susceptibility of the EuAg$_{4}$As$_{2}$ single crystal under several selected magnetic fields for $\textit{H}$//$\textit{ab}$ (a) and $\textit{H}$//$\textit{c}$ (d), below $\textit{T}$=50 K. For selected magnetic fields along the $\textit{ab}$-plane, both field-cooled (FC, hollow circles) and zero-field-cooled (ZFC, solid circles) data are shown. For most other cases, only the ZFC data are shown. In the case of $\textit{H}$//$\textit{ab}$, the data have been shifted for clarity except for those taken in the 0.1 T field. Field dependence of magnetisation of the EuAg$_{4}$As$_{2}$ single crystal at various temperatures, with the field parallel to the $\textit{ab}$-plane (b) and $\textit{c}$-axis (e). The data taken below $\textit{T}$=14 K have been shifted for clarity. (c) Field dependence of $\textit{M}$$_{ab}$ (top) and its first derivative (bottom) taken in the field-increasing process at $\textit{T}$=2 K. (f) Field dependence of $\textit{M}$$_{c}$ (top) and its first derivative (bottom) at $\textit{T}$=2 K. The dashed lines are visual guides.

  • Figure 3

    (Color online) Temperature dependence of the in-plane (left) and out-plane (right) resistivity of EuAg$_{4}$As$_{2}$ single crystal.

  • Figure 4

    (Color online) Temperature dependence of in-plane resistivity $\rho$$_{ab}$ of EuAg$_{4}$As$_{2}$ single crystal under several selected fields for $\textit{H}$//$\textit{ab}$ (a) and $\textit{H}$//$\textit{c}$ (b), below $\textit{T}$=40 K. The dashed lines are visual guides.

  • Figure 5

    (Color online) Field dependence of the MR at several temperatures for $\textit{H}$//$\textit{ab}$ (a) and $\textit{H}$//$\textit{c}$ (d). The applied current is parallel to the field in the case of $\textit{H}$//$\textit{ab}$. (b) Field dependence of MR$^{ab}$ (left) and its first derivative (right) at $\textit{T}$=2 K. (c) First derivative of $\textit{M}$$_{ab}$ as a function of field at $\textit{T}$=2 K. (e) Field dependence of MR$^{c}$ (left) and its first derivative (right) at $\textit{T}$=2 K. (f) First derivative of $\textit{M}$$_{c}$ as a function of field at $\textit{T}$=2 K. The dashed lines are visual guides.

  • Figure 6

    (Color online) Magnetic phase diagram of EuAg$_{4}$As$_{2}$ for $\textit{H}$//$\textit{ab}$-plane (a) and $\textit{H}$//$\textit{c}$-axis (b). The symbols are extracted from the $\textit{M}$-$\textit{T}$ (black), $\textit{M}$-$\textit{H}$ (red), $\textit{R}$-$\textit{T}$ (green), and MR-$\textit{H}$ (blue) curves, respectively. The dashed lines are visual guides.

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