The magnetic ground state of a non-symmorphic square-net lattice, TbAgSb2

We have investigated the magnetic properties of a non-symmorphic correlated material, TbAgSb2. It consists of a quasi-two-dimensional structure of Sb atoms which hosts topologically non-trivial fermions. We prepared high quality single crystals of the material. The magnetic and transport properties exhibit antiferromagnetic transition at 11.3 K. A strong magneto-crystalline anisotropy is observed with the magnetic moments preferentially aligned within the ab-plane at low temperatures. A broad peak in the magnetic susceptibility along H||c direction suggests influence of crystal electric field in magnetism, which is also manifested in the specific heat data. The temperature dependent electrical resistivity at high field shows interesting signature of field induced magnetic structure reorientation / superzone formation. These results highlight the significance of Sb square nets in a non-symmorphic correlated system exhibiting complex magnetism and electronic properties.