Comment on High-Pressure Behavior of Hydrogen and Deuterium at Low Temperatures

TL;DR

This paper critically examines claims of a new solid phase of D2 at high pressure and low temperature, arguing that the data do not support the original claim based on Raman analysis and phase transition theory.

Contribution

The paper provides a critical analysis challenging the existence of a new D2 solid phase, offering alternative interpretation of Raman data and phase transition theory.

Findings

Original data does not support the new D2 phase claim

Reinterpretation of Raman data suggests different phase behavior

Highlights importance of rigorous data analysis in phase identification

Abstract

X.-D. Liu et al. [Phys. Rev. Lett. 119, 065301 (2017)] report on the existence of a new unique solid phase of D2, which makes the high-pressure low-temperature behavior distinct from H2. Here, based on the analysis of their Raman data and phase transition theory, we show that the presented data do not support this claim.