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Refinement of the incommensurate structure of high quality Bi-2212 single crystals from a neutron diffraction study by P.A Miles; S.J Kennedy; G.J McIntyre; G.D Gu; G.J Russell; N Koshizuka is a Physics and Astronomy article available to read on EtoBox.

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We report the results of the refinement of data collected by neutron diffraction from a large single crystal of Ž . Bi Sr CaCu O Bi-2212 which has an incommensurately modulated superlattice. These results are important in locating the positions of the oxygen atoms and their modulation by using four-dimensional crystallographic analysis. The four-dimensional space group is found to be consistent with N Bbmbr111. We do not find excess oxygen but do observe large modulations in the oxygen associated with the bismuth ions in the lattice. This is consistent with the superconducting transition temperature of 91 K with a sharp 2 K width obtained from oxygen deficient ''as-grown'' crystals. Our overall weighted r-factor is 0.052 including up to second order satellites, which is better than other published results for both single crystals and powders, obtained from X-ray and neutron diffraction studies. q 1998 Elsevier Science B.V.

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Author

P.A Miles; S.J Kennedy; G.J McIntyre; G.D Gu; G.J Russell; N Koshizuka

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0921-4534)

Published

1998

Language

EN

Field

Physics and Astronomy (Physical Sciences)