We report single crystal synthesis, specific heat and resistivity measurements and electronic structure calculations for BaCr2As2. This material is a metal with itinerant antiferromagnetism, similar to the parent phases of Fe-based high temperature superconductors, but differs in magnetic order. Comparison of bare band structure density of states and the low temperature specific heat implies a mass renormalization of ∼ 2. BaCr2As2 shows stronger transition metal - pnictogen covalency than the Fe compounds, and in this respect is more similar to BaMn2As2. This provides an explanation for the observation that Ni and Co doping is effective in the Fe-based superconductors, but Cr or Mn doping is not.
@article{arxiv.0902.0945,
title = {Itinerant antiferromagnetism in BaCr$_2$As$_2$},
author = {D. J. Singh and A. S. Sefat and M. A. McGuire and B. C. Sales and D. Mandrus and L. H. VanBebber and V. Keppens},
journal= {arXiv preprint arXiv:0902.0945},
year = {2009}
}
Comments
Additional discussion. Minor correction to Fermi velocities