Ordering Transitions in a Quantum Lattice-Gas Model of Adsorbed Systems
- 1 July 1973
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 8 (1) , 339-347
- https://doi.org/10.1103/physreva.8.339
Abstract
A quantum lattice-gas model of adsorbed systems is studied to determine the importance of quantum-mechanical processes upon order-disorder transition temperatures. The phase diagram of systems interacting with nearest-neighbor attractive and repulsive potentials is obtained within the Bethe-Peierls approximation. It is found that the transition temperature depends, in order of increasing importance, upon particle statistics, quantum tunneling, and the nearest-neighbor interaction strength. The results are applied to systems of helium adsorbed on graphite.Keywords
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