Comment: Essence of intrinsic tunneling: Distinguishing intrinsic features from artifacts [Phys.Rev.B 72 (2005) 094503]

TL;DR

This paper clarifies that the true interlayer current-voltage characteristics in high-temperature superconductors are non-Ohmic, countering claims that they are Ohmic and challenging previous interpretations of intrinsic tunneling phenomena.

Contribution

It refutes a recent argument claiming Ohmic behavior in interlayer I-V characteristics, reaffirming the non-Ohmic nature essential for understanding intrinsic tunneling in HTSC.

Findings

Interlayer I-V characteristics are strongly non-Ohmic

Disproves the claim of Ohmic behavior in HTSC interlayer transport

Supports the existence of intrinsic tunneling and Josephson effects

Abstract

In a recent paper V.Zavaritsky has argued that interlayer ($c-$ axis) current-voltage characteristics of high temperature superconductors (HTSC) are Ohmic, and has claimed to disprove all findings of intrinsic tunnelling spectroscopy, as well as existence of the interlayer tunnelling and the intrinsic Josephson effect in HTSC, as such. In this comment I demonstrate, that the genuine interlayer current-voltage characteristics are strongly non-Ohmic, which undermines the basic postulate and the logical construction of the criticized paper.