To the Editor: comment on Eremets and Troyan, Nature Mater. 10, 927-931 (2011)

TL;DR

This paper critically examines claims of producing a conducting liquid hydrogen state at high pressure, questioning whether the evidence truly indicates hydrogen transformation or other phenomena.

Contribution

It provides a critical analysis of experimental claims, emphasizing the need for more conclusive evidence of hydrogen phase transitions under extreme conditions.

Findings

The evidence presented may not definitively prove hydrogen transformation.

Disappearance of Raman signals alone is insufficient as proof.

Further validation is necessary for claims of metallic hydrogen.

Abstract

Eremets and Troyan (Nature Mater. 10, 927-931 (2011)) claim that they produced the conducting liquid hydrogen state at 270 GPa and 295 K. Their evidence consists of disappearance of Raman signals, visual observations, and measurements of electrical conductivity in diamond anvil cells (DAC). However, there is no proof that the reported observations are due to transformations in hydrogen.