0.05 meV. 

6 In Ref. 3, unconventional notations for the high symmetry points are used; conventional A ( π, 0 , π ) is called R, and conventional R ( π, π, π ) is called A. I am using the standard notations. 7 

I have tried only a checkerboard antiferromagnetic arrange- ment, since I do not see any a priori reason for any other antiferromagnetic ordering (the fact that the crystal struc- ture coincides with that of pnictide superconductors is not an argument at all that this material would assume the 

same exotic magnetic structure). Of course, this does not mean that there are no spin fluctuations with a finite wave vector; it only tells us that if such fluctuations occur, they occur at a wave vector, different from π, π (in the unfolded Brillouin zone notation). 

8 I. I. Mazin, Appl. Phys. Lett. 77 , 3000 (2000). 9 

P. Larson, I.I. Mazin, D.J. Singh, Phys. Rev. B69 , 064429 (2004). 

