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We report discovery of new antiferromagnetic semimetal EuZnSb$_2$, obtainedand studied in the form of single crystals. Electric resistivity, magneticsusceptibility and heat capacity indicate antiferromagnetic order of Eu with$T_N$ = 20 K. The effective moment of Eu$^{2+}$ inferred from the magnetizationand specific heat measurement is 3.5 $\mu_B$, smaller than the theoreticalvalue of Eu$^{2+}$ due to presence of both Eu$^{3+}$ and Eu$^{2+}$. Magneticfield-dependent resistivity measurements suggest dominant quasi two dimensionalFermi surfaces whereas the first-principle calculations point to the presenceof Dirac fermions. Therefore, EuZnSb$_2$ could represent the first platform tostudy the interplay of dynamical charge fluctuations, localized magnetic 4$f$moments and Dirac states with Sb orbital character.

Magnetic mixed valent semimetal EuZnSb$_2$ with Dirac states in the band structure