Comment on "Understanding the $\mu$SR spectra of MnSi without magnetic   polarons"
  Amato {\it et al.} have reported transverse field muon spin rotation experiments performed on single crystal of MnSi in a single magnetic field of 5200 Oe at a single temperature of 50 K. They present the angular dependence of the muon precession frequencies which they interpret in terms of dipolar magnetic field experienced by bare muons. Such interpretation comes from a rather mechanistic approach without plausible physical backing: the wealth of experimental data collected so far does not justify this oversimplification. %approach. No consideration is given to a fundamental feature of MnSi --- strong magnetic field inhomogeneities on the scale of a lattice spacing found by many different techniques. The computational procedure also raises a number of objections, in particular, applicability of Kohn-Sham DFT to strongly correlated systems like MnSi. We demonstrate that the conclusion of "Understanding the $\mu$SR spectra of MnSi without magnetic polarons" is premature. 
Vyacheslav G. Storchak and Andrey M. Tokmachev
cond-mat.str-el