DIAS-STP-04-02 Two order parameters in quantum XZ spin models with Gibbsian ground states. T.C. Dorlas & W. Skrypnik This preprint is available for download : Portable Document Format (Size: 136K) Postscript (Size: 316K) To obtain copies of any of the preprints in the archives, please contact us and specify the preprint number(s), author(s), title(s) and … Continue reading 2004-02 – Two order parameters in quantum XZ spin models with Gibbsian ground states.