Crystal structure of a new high-T/sub c/ TlBa/sub 2/Ca/sub 3/Cu/sub 4/O/sub 11/ superconductor by high-resolution electron microscopy

Journal Article · Thu Dec 01 04:00:00 EST 1988 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.38.11952· OSTI ID:6619781

Ihara, H; Sugise, R; Hayashi, K; Terada, N; Jo, M; Hirabayashi, M; Negishi, A; Atoda, N; Oyanagi, H; Shimomura, T; others, and

The crystal structure of a new high-T/sub c/ TlBa/sub 2/Ca/sub 3/Cu/sub 4/O/sub 11/ (1:2:3:4) superconductor was studied by a high-resolution electron microscopic measurement. The electron diffraction patterns give a simple tetragonal lattice with the lattice constants of a = b = 3.9 A and c = 19 A. The lattice image viewed along (010) showed clearly the single Tl-O layer alternating with four Cu-O sheets. The A-site layers of Ba or Ca atoms also alternate with the B-site layers of Tl or Cu atoms as in the layered perovskite compound ABO/sub x/. Since oxygen sites in the Ca layer are vacant, the structure is one of the oxygen-deficient perovskite. This phase has a new space group of P4/mmm different from the previous cuprate oxide superconductors and it has a large new superconductor family of TlBa/sub 2/Ca/sub n//sub -1/Cu/sub n/O/sub 2//sub n//sub +3/ (n = 1,2,3,4,5,. . .).

• Research Organization: Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki 305, Japan
• OSTI ID: 6619781
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 38:16; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
LAYERS
MICROSCOPY
OXIDES
OXYGEN COMPOUNDS
SUPERCONDUCTORS
TETRAGONAL LATTICES
THALLIUM COMPOUNDS
THALLIUM OXIDES
TRANSITION ELEMENT COMPOUNDS