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A recent paper from Raveau's group (arXiv:1106.6253) has shown the existenceof a glass-like arrested state in two calcium-doped cobaltites, which consistsof coexisting ferromagnetic and antiferromagnetic phase fractions, resultingfrom arrest of kinetics at low temperature,. They use the "cooling and heatingin unequal magnetic field (CHUF)" measurement protocol to show devitrificationof the arrested state. They use the same section title, protocol name, andacronym as in the paper (arXiv:0805.1514) where the protocol was presented,justified, and exploited. They nowhere refer to that paper, or to its journalcounterpart. We put the development of this CHUF protocol in perspective,bringing out that it was conceived for broadened first order transitions wherethe kinetics of the transformation gets hindered. We also point out itsapplicability in view of our various subsequent works (arXiv:0911.4552,arXiv:1003.4400 and their journal counterparts) further exploiting thisprotocol. The paper being commented on is also silent about these latter papers(or their journal counterparts) even though the use of this protocol ishighlighted in these in the abstract itself.

Comment on "Formation of magnetic glass in calcium doped YBaCo$_2$O$_{5.5}$ cobaltites" [arXiv:1106.6253]