An Ising model approach to the problem of oxygen ordering in the basal plane of YBa2Cu3O6 + 2c

V.M. Matic

Physica A: Statistical Mechanics and its Applications, 1992, vol. 184, issue 3, 571-586

Abstract: Oxygen ordering in the basal plane of the YBa2Cu3O6 + 2c system can be described in terms of the two-dimensional Ising model with asymmetric next-nearest-neighbor interactions. The phase diagram is calculated by means of a cluster variation method, using the values of interaction energies which follow from the linear muffin-tin orbital (LMTO) method, and compared with previous known results. The low-temperature structure is examined and it is found that O-Cu-O chains consist of oxygen occupied and uncopied segments. The average number of oxygen atoms in oxygen occupied segments is calculated as a function of temperature T and concentration c.

Date: 1992
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:184:y:1992:i:3:p:571-586

DOI: 10.1016/0378-4371(92)90323-I

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