Department of Physics Papers

Document Type

Journal Article

Date of this Version

3-15-1971

Publication Source

Journal of Applied Physics

Volume

42

Issue

4

Start Page

1574

Last Page

1580

DOI

10.1063/1.1660352

Abstract

A physically meaningful analogy is drawn between the ordering and dynamical behavior of molecular rotations in solid hydrogen and the ordering and dynamical behavior of magnetic spin systems. In solid hydrogen the magnitude J of the rotational angular momentum is a good quantum number. Molecules having J = 1 resemble spin one magnetic moments, whereas those with J = 0 are "non‐magnetic." Solid solutions of these two species are analogs of magnetic alloys. The thermodynamic properties, in particular the order parameter, the specific heat, and the nuclear magnetic resonance properties are similar to those of magnetic systems. As for the dynamics, the small librations about the ground state are analogs of spin waves, and the interactions between the librational excitations are similar to, but larger than, the usual spin‐wave interactions. This circumstance enables the direct observation of the two‐libron spectrum and also leads to large anharmonic shifts in the single‐libron spectrum.

Copyright/Permission Statement

Reprinted with permission from the Journal of Applied Physics. Copyright 1971, American Institute of Physics

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Date Posted: 12 August 2015

This document has been peer reviewed.