Electronic Resource
Springer
Journal of low temperature physics
23 (1976), S. 491-494
ISSN:
1573-7357
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Calorimetric measurements on 3He-4He monolayers by Hickernell, McLean, and Vilches indicate that isotopic ordering takes place in both the low-density and registered lattice gas regimes. The low-density film heat capacity corresponds to imperfect 2D gas mixtures above T − 1 K. At lower temperatures the 4He fraction condenses to a 2D liquid, and the concurrent decrease in mixing entropy indicates concurrent isotopic separation. In the registered lattice gas mixtures the mixing entropy changes by a much smaller amount over the experimental region. It is argued that the observed changes are due to shortrange isotopic ordering tending towards segregation. From a detailed comparison with an Ising model, we estimate a transition temperature T c≈ 30 mK.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00116937
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