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The Orientational Ordering of Molecular Hydrogen in 2D (2000)

Sullivan, N. S. ; Kim, K.

Springer

Journal of low temperature physics 120 (2000), S. 89-106

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ISSN: 1573-7357

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract The orientational ordering of ortho-hydrogen molecules on a triangular lattice is calculated as a function of ortho concentration using the method of restricted traces. The calculated temperatures for the transitions from the disordered phase to the long range pinwheel ordered phase show a strong concentration dependence with a critical concentration X c=73% below which the long range ordering is not realized in this model. The results are consistent with recent NMR studies of ortho-para hydrogen mixtures adsorbed as a commensurate $$\sqrt 3 $$ × $$\sqrt 3 $$ structure on hexagonal boron nitride for which X c=69±4%. The values of the observed transition temperatures can only be understood if there is a large renormalization of the effective quadrupolar interaction constant in 2D.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1004660919750

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