Journal
PHYSICAL REVIEW B
Volume 84, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.136501
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In a recent paper, Kurter et al. [Phys. Rev. B 81, 224518 (2010)] analyzed self-heating in strongly-driven Bi2Sr2CaCu2O8+delta mesa structures. They attributed observed peaks in conductance to heating of mesas up to the superconducting critical temperature T-c, extrapolated this statement to much smaller mesas, used in intrinsic tunneling spectroscopy (ITS), and called for reinterpretation of ITS data. They also suggested a universal figure of merit for the shape of tunneling characteristics. Here, I argue that the peak in c-axis conductance usually occurs well below Tc; that for small ITS mesas, it represents the superconducting gap; and that the genuine shape of tunneling characteristics for cuprates is not universal but depends on doping, uniformity, and geometry.
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