Variation in T sub c and carrier concentration in Tl-based superconductors

Journal Article · Thu Nov 30 23:00:00 EST 1989 · Physical Review (Section) B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.40.11400· OSTI ID:5117274

Shimakawa, Y; Kubo, Y; Manako, T; Igarashi, H ^[1]

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1. Fundamental Research Laboratories, NEC Corporation, 4-1-1 Miyazaki, Miyamae-ku, Kawasaki 213, Japan (JP)

{ital T}{sub {ital c}} variations observed in some Tl-based superconductors were investigated. Clear correlations were found between {ital T}{sub {ital c}}, carrier concentration, and {ital c}-axis length. In particular, for Tl{sub 2}Ba{sub 2}CuO{sub 6}, a decrease in oxygen content of about 0.1 per formula unit, which corresponded to a decrease in hole concentration of 0.2, increased {ital T}{sub {ital c}} up to about 80 K, and elongated the {ital c} axis by about 0.4%. The carrier concentration in that system could be decreased by substitution of La for Ba, which resulted in an increased {ital T}{sub {ital c}} value. {ital T}{sub {ital c}} variations caused by a change in oxygen content were also observed in Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub 8} and Tl{sub 2}Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub 10}. It was demonstrated that superconductivity appears in a certain appropriate range of carrier concentration.

• OSTI ID: 5117274
• Journal Information: Physical Review (Section) B: Condensed Matter; (USA), Journal Name: Physical Review (Section) B: Condensed Matter; (USA) Vol. 40:16; ISSN 0163-1829; 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
ANNEALING
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CARRIER DENSITY
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
HEAT TREATMENTS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
STOICHIOMETRY
SUPERCONDUCTIVITY
THALLIUM COMPOUNDS
THALLIUM OXIDES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE