Comment on: "The Frenkel Line: a direct experimental evidence for the new thermodynamic boundary"

TL;DR

This paper critically examines a recent claim of experimental evidence for the Frenkel line in supercritical argon, arguing that the reported observations are due to experimental path irregularities rather than a true structural transition.

Contribution

It clarifies that the previous experimental results do not constitute evidence for the Frenkel line, emphasizing the importance of experimental path control in such studies.

Findings

No direct experimental evidence of structural transformation was found.

Reported observations are attributed to irregular experimental paths.

The paper questions the validity of previous claims regarding the Frenkel line.

Abstract

In a recent publication (D. Bolmatov et al. Sci.Rep. 5, 15850 (2015)) the experimental observation of structural transformations on crossing the Frenkel line in supercritical argon is claimed. Here we show that no experimental evidence of the structural transformation was presented. The reported experimental observations which Bolmatov et al. claim as evidence of a transition across the Frenkel line are instead due to the irregularity of the experimental (P,T) path in their work.