Comment on ''Low to High Spin-state Transition Induced by charge   ordering in Antiferromagnetic YBaCo2O5"
  In the commented Letter Vogt et al. (Phys.Rev.Lett. 84 (2000) 2969) claim the existence of a spin-state transition in YBaCo2O5. We think that this claim about the change from the low spin to high spin state upon cooling in YBaCo2O5 is errorneous. Keywords: magnetism, 3d ions, low spin. 
Z.Ropka, R.J. Radwanski