We report discovery of new antiferromagnetic semimetal EuZnSb2, obtained and studied in the form of single crystals. Electric resistivity, magnetic susceptibility and heat capacity indicate antiferromagnetic order of Eu with TN = 20 K. The effective moment of Eu2+ inferred from the magnetization and specific heat measurement is 3.5 μB, smaller than the theoretical value of Eu2+ due to presence of both Eu3+ and Eu2+. Magnetic field-dependent resistivity measurements suggest dominant quasi two dimensional Fermi surfaces whereas the first-principle calculations point to the presence of Dirac fermions. Therefore, EuZnSb2 could represent the first platform to study the interplay of dynamical charge fluctuations, localized magnetic 4f moments and Dirac states with Sb orbital character.
@article{arxiv.2009.10720,
title = {Magnetic mixed valent semimetal EuZnSb$_2$ with Dirac states in the band structure},
author = {Aifeng Wang and Sviatoslav Baranets and Yu Liu and Xiao Tong and E. Stavitski and Jing Zhang and Yisheng Chai and Wei-Guo Yin and Svilen Bobev and C. Petrovic},
journal= {arXiv preprint arXiv:2009.10720},
year = {2020}
}