Comment on Counterintuitive consequence of heating in strongly driven intrinsic junctions of Bi2Sr2CaCu2O8+δ mesas
Abstract
In a recent paper [Phys.Rev.B 81, 224518 (2010)], C. Kurter et al, analyzed the effect of strong self-heating in large-area Bi2Sr2CaCu2O8+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.
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