Quadrupolar Glass State in para-hydrogen and ortho-deuterium under pressure

TL;DR

This paper predicts the existence of a quadrupolar glass state in para-hydrogen and ortho-deuterium under high pressure, using a theoretical model to analyze their glassy behavior and orientational order.

Contribution

It introduces a quadrupolar model with J=2 for high-pressure states and analyzes the continuous growth of orientational order and glass regime in these substances.

Findings

Quadrupolar glass state predicted in high-pressure para-hydrogen and ortho-deuterium.

Continuous growth of orientational order and glass regime upon cooling.

Analogy with glassy behavior in low-pressure ortho-hydrogen.

Abstract

The main features of the possible quadrupolar glass state in ortho-deuterium and para-hydrogen under high pressure are predicted and considered in replica-symmetric approximation in analogy with glassy behavior of diluted ortho-hydrogen at low pressures. The quadrupolar model with J = 2 is suggested. The orientational order and glass regime grow continuously on cooling just as it is in the case of ortho-para hydrogen mixtures at zero pressure.