Formation of superconducting (Tl,Bi)Sr sub 2 CaCu sub 2 O sub y thin films by rf sputtering and thallium diffusion

Journal Article · Mon May 21 04:00:00 EDT 1990 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.103236· OSTI ID:6886921

Liu, R S; Edwards, P P; Hunneyball, P D; Bennett, M J ^[1]; Jedamzik, D; Harrison, M R; Horley, R J ^[2]

---

1. IRC in Superconductivity, University of Cambridge, Madingley Road, Cambridge CB3 0HE, United Kingdom (GB)
2. GEC plc, Hirst Research Centre, East Lane, Wembley, Middlesex, HA9 7PP (United Kingdom)

We have prepared new high {ital T}{sub {ital c}} superconducting thin films of (Tl,Bi)-Sr-Ca-Cu-O by combining low temperature (500 {degree}C) rf sputtering of Bi-Sr-Ca-Cu-O precursor films and thallium diffusion. A typical film has {ital T}{sub {ital c}(onset)} =80 K, {ital T}{sub {ital c}(midpoint)} =79 K, and {ital T}{sub {ital c}(zero)} =50 K. X-ray diffraction and energy dispersive spectroscopic studies were carried out to determine the composition and crystal structure of the superconducting phase within the film. We identified a material with the chemical composition of (Tl{sub 0.7} Bi{sub 0.3} )Sr{sub 2}CaCu{sub 2}O{sub {ital y}} and tetragonal symmetry ({ital a}=3.795 A and {ital c}=12.095 A), and propose that this phase is responsible for superconductivity around 80 K. The film also has a highly preferred orientation with the {ital c} axis perpendicular to the surface of the (100)MgO substrate.

• OSTI ID: 6886921
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 56:21; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ATOM TRANSPORT
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHEMICAL COMPOSITION
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FILMS
NEUTRAL-PARTICLE TRANSPORT
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIATION TRANSPORT
SCATTERING
SPUTTERING
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTING FILMS
SUPERCONDUCTIVITY
THALLIUM COMPOUNDS
THALLIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION