Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
977231 | Physica A: Statistical Mechanics and its Applications | 2009 | 11 Pages |
Abstract
The effects of both an exchange anisotropy and a single-ion anisotropy on the phase diagram of the mixed spin-1 and spin-12 Heisenberg model are investigated by the use of an Oguchi approximation. Particular emphasis is given to the simple cubic lattice with coordination number z=6z=6 for which the phase diagram and magnetizations are determined numerically. Besides second-order transitions, lines of first-order transitions terminating either at a tricritical point or an isolated critical point, are determined. The origin and nature of the new ordered phase in the quantum mixed-spin system at the low temperature region is also discussed.
Related Topics
Physical Sciences and Engineering
Mathematics
Mathematical Physics
Authors
A. Bobák, V. Pokorný, J. Dely,