Model family of high-temperature superconductors: Tl/sub m/Ca/sub n//sub -1/Ba/sub 2/Cu/sub n/O/sub 2(//sub n//sub +1)+//sub m/ (m = 1,2; n = 1,2,3)

Journal Article · Sat Oct 01 04:00:00 EDT 1988 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.38.6531· OSTI ID:6824501

Parkin, S S.P.; Lee, V Y; Nazzal, A I; Savoy, R; Huang, T C; Gorman, G; Beyers, R

We describe the structures and superconducting properties of six compounds in the Tl-Ca-Ba-Cu-O system of the general form, Tl/sub m/Ca/sub inr-1/Ba/sub 2/Cu/sub n/O/sub 2(//sub n//sub +1)+//sub m/, where m = 1 or 2 and n = 1, 2, or 3. One of these compounds displays the highest known superconducting transition temperature, T/sub c/approx. =125 K. The structures of these compounds consist of copper perovskitelike blocks containing 1, 2, or 3 CuO/sub 2/ planes separated by one or two Tl-O layers and thus form a model family of structures in which both the size and separation of the copper oxide blocks can be independently varied. The superconducting transition temperature increase with the number of CuO/sub 2/ planes in the perovskitelike block for both the Tl-O monolayer and bilayer compounds. For each pair of compounds (m = 1,2) with the same number of CuO/sub 2/ planes (same n), the transition temperatures are similar but are consistently 15--20 K lower in the material with single Tl-O layers. Variations in the transition temperatures in the double- and triple-CuO/sub 2/-layer compounds are observed to correlate with increased densities of intergrowths of related structures.

• Research Organization: IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120-6099
• OSTI ID: 6824501
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 38:10; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
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 MODELS
CRYSTAL STRUCTURE
DATA
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
INFORMATION
MATHEMATICAL MODELS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PEROVSKITES
PHYSICAL PROPERTIES
STOICHIOMETRY
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THALLIUM COMPOUNDS
THALLIUM OXIDES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE