Istituto dei materiali per l'elettronica ed il magnetismo     
Lebedev O., Van Tendeloo G., Licci F., Gilioli E., Gauzzi A., Prodi A., Marezio M. Superconductivity and microstructure of YSr2Cu3O6.875. In: Physical Review B, vol. 66 (13) article n. 132510. American Physical Society, 2002.
The crystal structure of YSr2Cu3O6+x synthesized under high pressure has been studied in detail using transmission electron microscopy and powder neutron diffraction. It has been shown that YSr2Cu3O6+x and YBa2Cu3O6+x are not isostructural after all. The much lower T-c of YSr2Cu3O6+x (YSCO) with respect to that of YBa2Cu3O6+x has to be ascribed to the different structural arrangement of the reservoir blocks. The different oxygen ordering and the consequent displacement of the Sr and Cu1 cations in YSCO yield an orthorhombic modulated structure with a propagation vector of 1/4[012]*. Perfectly ordered YSCO would have an oxygen stoichiometry equal to 6.875. Powder neutron-diffraction data yielded O-7.20 and O-6.92 for the as-prepared and annealed phases, respectively
URL: http://link.aps.org/doi/10.1103/PhysRevB.66.132510
DOI: 10.1103/PhysRevB.66.132510
Subject Compound System; Pressure; Ba; Substitution; Temperature; Crystal; 150-K
74.72.Bk, 61.12.Ld, 68.37.Lp, 82.40.Fp

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