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  • Title: The incommensurate modulation of the 2212 bi-sr-ca-cu-o superconductor.
    Author: Gao Y, Lee P, Coppens P, Subramania MA, Sleight AW.
    Journal: Science; 1988 Aug 19; 241(4868):954-6. PubMed ID: 17731444.
    Abstract:
    The incommensurate modulation evident in the diffraction pattern of the superconductor Bi(2)Sr3-xCa(x)Cu(2)O8+y consists of almost sinusoidally varying displacements of up to 0.4A of the Bi and Sr atoms in the a-and c-directions of the unit cell, and of up to 0.3 A of the Cu atoms in the c direction only. Thus, a newly discovered feature of the Bi(2)Sr3-xCaxCu(2)O8+y structure is sizable Cu displacement, which is related to static wave formation in the Cu-O sheets. Reported thermal parameters give evidence that similar distortions occur on cooling of the thallium-containing superconductors.
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