In a recent paper [Phys.Rev.B 81, 224518 (2010)], C. Kurter et al, analyzed
the effect of strong self-heating in large-area
Bi2​Sr2​CaCu2​O8+δ​ (Bi-2212) mesa structures. They conclude
that dI/dV conductance peaks in their mesas occur when mesas are heated to
the superconducting critical temperature Tc​. Further on they extrapolate
this statement for all mesas, including much smaller and much better thermally
anchored mesas used in Intrinsic Tunnelling Spectroscopy (ITS). Here I show
that their conclusion does not hold neither for previously reported data, nor
even for their own mesas; the very remote extrapolation to ITS is invalid. I
also point out a number of inconsistencies and misleading references.Comment: 2 page