Comment on "c-axis Josephson tunneling in $D_{x^2-y^2}$-wave superconductors''

TL;DR

This comment critically addresses and refutes the findings of a recent paper on c-axis Josephson tunneling in d-wave superconductors, asserting that the original paper's conclusions are entirely incorrect.

Contribution

It provides a critical correction to the previous work, clarifying misunderstandings about Josephson tunneling in d-wave superconductors.

Findings

The original paper's conclusions are incorrect.

The comment clarifies the theoretical understanding of Josephson tunneling.

It emphasizes the importance of correct modeling in superconductor junctions.

Abstract

This comment points out that the recent paper by Maki and Haas [Phys. Rev. B {\bf 67}, 020510 (2003)] is completely wrong.