Quantum and Classical Orientational Ordering in Solid Hydrogen

Journal Article · Sat Feb 01 04:00:00 EST 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.78.1066· OSTI ID:450467

Mazin, I; Hemley, R J; Goncharov, A; Hanfland, M; Mao, H ^[1]

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1. Geophysical Laboratory and Center for High-Pressure Research, Carnegie Institution of Washington,5251 Broad Branch Rd., N.W., Washington, D.C. 20005-1305 (United States)

We present a unified view of orientational ordering in phases I, II, and III of solid hydrogen. Phases II and III are orientationally ordered, but the ordering objects in phase II are angular momenta of rotating molecules, whereas in phase III the molecules order themselves. This concept provides a quantitative explanation for the vibron softening, libron and roton spectra, and the increase of the vibron effective charge in phase III, as well as a framework for understanding the topology of the phase diagram and ortho-para state at high pressure. The effective charge and the infrared and Raman vibron frequency shifts are all linear in the order parameter in phase III. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 450467
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 6 Vol. 78; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CRYSTALS
HYDROGEN
INFRARED SPECTRA
MOLECULAR CRYSTALS
PHASE DIAGRAMS
PRESSURE DEPENDENCE
RAMAN SPECTRA
ROTONS
VIBRON MODEL