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Several recent studies have shown that the anisotropy in the magneticstructure of \ECA\ plays a significant role in stabilizing the Weyl nodes. Toinvestigate the relationship between magnetic anisotropy and Weyl physics, wepresent a comparative study between EuZn$_2$As$_2$ and EuCd$_2$As$_2$ that areisostructural but with different magnetic anisotropy. We performed structuralanalysis, electronic transport, and magnetization experiments onmillimeter-sized single crystals of EuZn$_2$As$_2$, and compared the results tothose of EuCd$_2$As$_2$. By combining the first principle calculations andneutron diffraction experiment, we identify the magnetic ground state ofEuZn$_2$As$_2$ as A-type antiferromagnetic order with a transition temperature($T_\mathrm{N}$ = 19.6 K) twice that of EuCd$_2$As$_2$. Like EuCd$_2$As$_2$,the negative magnetoresistance of EuZn$_2$As$_2$ is observed after suppressingthe resistivity peak at $T_\mathrm{N}$ with increasing fields. However, theanisotropy in both transport and magnetization are much reduced inEuZn$_2$As$_2$. The difference could be ascribed to the weaker spin-orbitcoupling, more localized $d$-orbitals, and a larger contribution from the Eu$s$-orbitals in the zinc compound, as suggested by the electronic bandcalculations. The same band structure effect could be also responsible for theobservation of a smaller non-linear anomalous Hall effect in EuZn$_2$As$_2$compared to EuCd$_2$As$_2$.

Anisotropy of the magnetic and transport properties in EuZn$_2$As$_2$