Stolze, Joachim2008-06-032008-06-031990Stolze, Joachim: Oxygen ordering in the basal plane of YBa2Cu3Oz : Ground states. In: Physical Review Letters Nr. 8, Jg. 64(1990), S. 970-973, doi: 10.1103/PhysRevLett.64.970.http://hdl.handle.net/2003/2542410.17877/DE290R-8219The ground-state configurations of a lattice-gas model introduced by de Fontaine, Wille, and Moss for the distribution of empty and occupied oxygen sites in the Cu-O basal plane of the high-temperature superconductor YBa2Cu3Oz are determined. It is shown rigorously that the configurations proposed earlier by Wille and de Fontaine basically exhaust the set of possible stable ground-state structures. States of partial order are excluded, except for special values of the interaction constants.enThe American Physical Society51010.1103/PhysRevLett.64.970article (journal)