We present a theoretical investigation of the electronic and magnetic structure of spinel CdCr_2Te_4 using density functional theory, its extensions via onsite Hubbard U interactions, and a screened-hybrid-functional exchange potential. We find that the ground state is semiconducting within the latter approach, and within this magnetic-semiconducting system we compute the complex band structure, finding a slowly decaying evanescent Δ~1 state possibly suitable for realizing a spin-dependent symmetry filter effect.
@article{arxiv.1311.2265,
title = {Electronic Structure of Magnetic Semiconductor CdCr_2Te_4: A Possible Spin-Dependent Symmetry Filter},
author = {Hunter Sims and Karthik Ramasamy and William H. Butler and Arunava Gupta},
journal= {arXiv preprint arXiv:1311.2265},
year = {2013}
}