Abstract / Description of output
The cluster variation method is used to calculate a phase diagram for a
two-dimensional Ising model representing the Cu2O plane of
the high- T c superconductor
YBa2Cu3Oz. Both first ( V 1
and second-neighbor ( V 2) interactions are considered, with
V 2/ V 1= -1/2; At high temperatures, the
transition from the disordered (tetragonal) to the ordered
(orthorhombic) phase is second-order. A tricritical point is found below
which phase separation occurs. Fractional site occupancy and
second-neighbor pair correlations are calculated as a function of
temperature. The relevance of the model to the thermodynamics of
ordering in the high- T c compound is discussed.
Original language | English |
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Pages (from-to) | 1245-1253 |
Journal | Journal of Statistical Physics |
Volume | 50 |
Issue number | 5 |
DOIs | |
Publication status | Published - 1 Mar 1988 |
Keywords / Materials (for Non-textual outputs)
- Two-dimensional Ising model
- cluster variation method
- superconductors