Comment on 'Essence of intrinsic tunneling: Distinguishing intrinsic features from artifacts'

摘要

In a recent paper, Zavaritsky [Phys. Rev. B 72, 094503 (2005)] has argued that interlayer (c axis) current-voltage characteristics of high-temperature superconductors (HTSC) are Ohmic and that a simple self-heating model based on this assumption "provides a qualitative and quantitative description of key finding of intrinsic tunneling spectroscopy." In this Comment, I demonstrate that the genuine interlayer current-voltage characteristics are strongly non-Ohmic. Therefore, the self-heating model, advocated by Zavaritsky, can hardly provide correct explanation of nonlinearities observed in intrinsic tunneling spectra of HTSC.