Incommensurate modulation of the 2212 Bi-Sr-Ca-Cu-O superconductor

Journal Article · Fri Aug 19 04:00:00 EDT 1988 · Science (Washington, D.C.); (United States)

DOI:https://doi.org/10.1126/science.241.4868.954· OSTI ID:6616852

Gao, Y; Lee, P; Coppens, P; Subramanian, M A; Sleight, A W

The incommensurate modulation evident in the diffraction pattern of the superconductor Bi/sub 2/Sr/sub 3-x/Ca/sub x/Cu/sub 2/O/sub 8+y/ consists of almost sinusoidally varying displacements of up to 0.4 A 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/sub 2/Sr/sub 3-x/Ca/sub x/Cu/sub 2/O/sub 8+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. 14 references, 2 figures, 3 tables.

• OSTI ID: 6616852
• Journal Information: Science (Washington, D.C.); (United States), Journal Name: Science (Washington, D.C.); (United States) Vol. 241; ISSN SCIEA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
CALCIUM COMPOUNDS
COPPER COMPOUNDS
MODULATION
OXYGEN COMPOUNDS
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS