Itinerant antiferromagnetism in BaCr$_2$As$_2$

Details Itinerant antiferromagnetism in BaCr$_2$As$_2$ Itinerant antiferromagnetism in BaCr$_2$As$_2$

2009-02-05

arxiv.org/abs/0902.0945v2

Phys. Rev. B 79, 094429 (2009)

Physics

Condensed Matter

Superconductivity

Additional discussion. Minor correction to Fermi velocities

Scientific paper

10.1103/PhysRevB.79.094429

We report single crystal synthesis, specific heat and resistivity measurements and electronic structure calculations for BaCr$_2$As$_2$. 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 $\sim$ 2. BaCr$_2$As$_2$ shows stronger transition metal - pnictogen covalency than the Fe compounds, and in this respect is more similar to BaMn$_2$As$_2$. 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.

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