A simple thermodynamic model for the hydrogen phase diagram

Abstract

We describe a classical thermodynamic model that reproduces the main features of the solid hydrogen phase diagram. In particular, we show how the general structure types that are found by electronic structure calculations and the quantum nature of the protons can also be understood from a classical viewpoint. The model provides a picture not only of crystal structure, but also for the anomalous melting curve and insights into isotope effects, liquid metallisation and InfraRed activity. The existence of a classical picture for this most quantum of condensed matter systems provides a surprising extension of the correspondence principle of quantum mechanics, in particular the equivalent effects of classical and quantum uncertainty.

arXiv commentFinal author version

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Cited by in corpus (12)

• A Perspective on Conventional High-Temperature Superconductors at High Pressure: Methods and Materials
• Evidence for supercritical behavior of high-pressure liquid hydrogen
• Thermodynamic anomalies and three distinct liquid-liquid transitions in warm dense liquid hydrogen
• The role of van der Waals and exchange interactions in high-pressure solid hydrogen
• Infrared Peak-Splitting from phonon localization in Solid Hydrogen
• Understanding high pressure hydrogen with a hierarchical machine-learned potential
• Structures of solid hydrogen at 300K
• Isotope quantum effects in the metallization transition in liquid hydrogen
• Quadrupole Arrangements and the Ground State of Solid Hydrogen
• Two state model for critical points and the negative slope of the melting-curve
• The Icosahedral (H${}_2{)}_{13}$ Supermolecule
• Organic compounds in metallic hydrogen