[1] Ceder G., "A computational study of oxygen ordering in YBCO and its relation to superconductivity” Molecular Simulation 12 (1994)141
[2] Blagoev K. B., Wille L. T., ”First-order phase transition between orthorhombic phases in YBCO” PRB 48 (1993) 6588.
[3] Gerdanian P., Picards C., ”Some experimental evidence concerning the location of the OI–OII phase boundary in YBa2Cu3Oz”, Physica C 204 (1993)419.
[4] Matic V. M., Milic M., Lazarov N. D., ” Phase diagram of oxygen ordering in YBa2Cu3O6+2c: The three-atom interactions”, Physica C 422 (2005)1.
[5] Zimmermann M. V., Schneider J. R., Frello T., Anderson N. H., Madsen J., Käll M., Poulsen H. F., Liang R., Dosanjh P., Hardy W. N., ” Oxygen-ordering superstructures in underdoped YBa2Cu3O6+x studied by hard x-ray diffraction” PRB 68 (2003) 104515.
[6] Salje E. K. H., “Phase Transition in Ferroelastic and co-Elastic crystals”, Cambridge Univ. Press (1990).
[7] Schleger P., PhD Thesis, “Thermodynamics of oxygen ordering in YBCO”, University of British Columbia, Canada (1992).
[8] Mercer M., PhD thesis, “A study of oxygen in the YBCO, H-Tc superconducting material”, University of Salford, (1996).
[9] Poulsen H. F., von Zimmermann M., Schneider J. R., Andersen N. H., Schleger P., Madsen J., Hadfield R., Casalta H., Liang R., Dosanjh P., Hardy W., “Structural phase transitions in bulk YBa2Cu3O6+x with x=0.35 and x=0.36” PRB 53 (1996) 15335.
[10] Liang R., Bonn D.A., Hardy W.N., ”Preparation and X-ray characterization of highly ordered ortho-II phase YBa2Cu3O6.50 single crystals”, Physica C 336 (2000)57.
[11] Manca P., Sanna S., Calestani G., Migliori A., Lapinskas S., Tornau E.E., ”Orthorhombic low-temperature superstructures in YBa2Cu3O6+x” PRB 63 (2001) 134512.
[12] Islam Z., Liu X., Sinha S.K., Lang J.C., Moss S.C., Haskel D., Srajer G., Wochner P., Lee D.R., Haeffner D.R., Welp U., “Four-Unit-Cell Superstructure in the Optimally Doped YBa2Cu3O6.92 Superconductor”, PRL 93(2004)157008
[13] Strempfer J., Zegkinoglou I., Ru¨tt U., von Zimmermann M., Bernhard C., Lin C.T., Wolf T., Keimer B., “Oxygen Superstructures Throughout the Phase Diagram of (Y, Ca)Ba2Cu3O6-x”, PRL 93 (2004)157007
[14] Seo H.W., Chen Q.Y., Iliev M.N., Johansen T. H., Kolev N., Welp U., Wang C., Chu W.K., “Chain –oxygen ordering in twin-free YBa2Cu3o7-δ single crystals driven by 20-Kev electron irradiation”, PRB 72(2005)052501
[15] Khoshnevisan B., Ross D.K., ”An in-situ powder diffraction study of the structural mixed phase of YBCOx at 200̊C and 300̊C”, Iranian J. Crystallography and Mineralogy 1 (2007) 243.
[16] Yakhou F., Plakhtya V.B., Stratilatovb A., Burleta P., Lauriatc J.P., Elkaimc E., Henrya J.Y., Vlasovd M., Moshkind S., “The 2√2 a0 × √2 b0 × c0 herringbone phase of YBa2Cu3O6 + x. No oxygen ordering but an alien oxide, BaCu3O4”, Physica C 261(1996)315.
[17] Young R.A. “The Rietveld Method”, Oxford Science Publications (1993).
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