Transport properties and ARPES measurements of the Dirac line-node semimetals CaTX*

Recently noncentrosymmetric CaAgAs crystallizing in the P-6 2m space group has been proposed to be a topological line-node semimetal with only nontrivial bands near the Fermi level. In this talk we present magneto-transport properties, ARPES measurements and DFT calculations of single crystalline CaAgAs and its sister compound CaCdGe. At 2K and 9 T, linear transverse magnetoresistance (MR) up to 18{\%} is observed in CaAgAs while extremely large non-saturating quadratic MR up to 2500{\%} shows up in CaCdGe, attributing to the electron-hole compensation revealed by Hall measurements. This is consistent with the DFT calculation which reveals two hole and one electron Fermi pockets in CaCdGe. Angle-dependent Shubnikov-de Haas oscillations in CaCdGe resolve one of the hole Fermi pockets revealed by DFT. ARPES measurements on both compounds will be discussed too.