Crystal field and magnetism with Wannier functions: Rare-earth doped aluminum garnets

Using the recently developed method we calculate the crystal field parameters in yttrium and lutetium aluminum garnets doped with seven trivalent Kramers rare-earth ions. We then insert calculated parameters into the atomic-like Hamiltonian taking into account the electron-electron, spin-orbit and Zeeman interactions and determine the multiplet splitting by the crystal field as well as magnetic $\widehat{g}$ tensors. We compare calculated results with available experimental data.