The modulated structure of Bi2Sr3-xCaxCu2O8 is analyzed in the conventional three-dimensional space group Pnm utilizing single crystal X-ray diffraction data collected from a crystal showing a commensurate modulation period p=5a. The correlations of the parameters of related ions were large but a reliable model (R=0.0.082, Rw=0.071) is obtained. On the basis of the obtained results the structural modulation seems to be produced mainly by the mismatch between the perovskite block and the sterochemical requirements of Bi in the BiO layers. Differently from what was suggested in recent works, no clear evidence of extra oxygen in the BiO layer was found; a charge modulation on the Bi atoms seems indeed to play a role in determining the superconducting properties of this place.

The Modulated Structure of Bi2Sr3-xCaxCu2O8: a Commensurate Model from Single Crystal X-Ray Diffraction Data / Calestani, Gianluca; Rizzoli, Corrado; M. G., Francesconi; Andreetti, Giovanni Dario. - In: PHYSICA. C, SUPERCONDUCTIVITY. - ISSN 0921-4534. - 161:5-6(1989), pp. 598-606. [10.1016/0921-4534(89)90396-1]

The Modulated Structure of Bi2Sr3-xCaxCu2O8: a Commensurate Model from Single Crystal X-Ray Diffraction Data

CALESTANI, Gianluca;RIZZOLI, Corrado;ANDREETTI, Giovanni Dario
1989

Abstract

The modulated structure of Bi2Sr3-xCaxCu2O8 is analyzed in the conventional three-dimensional space group Pnm utilizing single crystal X-ray diffraction data collected from a crystal showing a commensurate modulation period p=5a. The correlations of the parameters of related ions were large but a reliable model (R=0.0.082, Rw=0.071) is obtained. On the basis of the obtained results the structural modulation seems to be produced mainly by the mismatch between the perovskite block and the sterochemical requirements of Bi in the BiO layers. Differently from what was suggested in recent works, no clear evidence of extra oxygen in the BiO layer was found; a charge modulation on the Bi atoms seems indeed to play a role in determining the superconducting properties of this place.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11381/2313479
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