Comment on "Nonlocal Effects on the Magnetic Penetration Depth in d-wave Superconductors"

TL;DR

This paper discusses the implications of the third law of thermodynamics on the temperature dependence of magnetic penetration depth in superconductors, regardless of pairing symmetry.

Contribution

It demonstrates that the first derivative of the magnetic penetration depth with respect to temperature must vanish at zero temperature, challenging previous assumptions.

Findings

First derivative of penetration depth vanishes at zero temperature

Implication holds for all Cooper pair symmetries

Supports thermodynamic consistency in superconductor models

Abstract

Based on the third law of thermodynamics it is shown, that the first derivative of the magnetic penetration depth with respect to temperature should vanish irrespective of the symmetry of Cooper pairs.