Josephson transport in Tl-cuprate bicrystal weak links

Journal Article · Sat Nov 30 23:00:00 EST 1996 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1007/BF00753873· OSTI ID:443656

Hu, Q H; Johansson, L G; Langer, V ^[1]

---

1. Univ. of Goeteborg and Chalmers Univ. of Technology (Sweden); and others

Superconducting epitaxial Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub 8} (Tl-2212) and Tl{sub 2}Ba{sub 2}CuO{sub 6} (Tl-2201) thin films are synthesized on single crystal and bicrystal LaAlO{sub 3} substrates by an ex-situ process. Tl-2212 films were optically smooth, with T{sub c}`s from 105 to 108K and {Delta}T{sub c} <2K, J{sub c} reaching 2 x 10{sup 6}A/cm{sup 2} at 77K. Tl-2201 films exhibited tetragonal or orthorhombic symmetry depending on the thallium content. The T{sub c} of the as-synthesized Tl-2201 films was in the range 40-55K. By oxygen depletion, T{sub c} was increased by 15 - 20 K. Properties of weak links in Tl-2212 and Tl-2201 thin films are reported.

• Sponsoring Organization: USDOE
• OSTI ID: 443656
• Report Number(s): CONF-960808--
• Journal Information: Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 5-6 Vol. 105; ISSN JLTPAC; ISSN 0022-2291
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
CALCIUM OXIDES
COPPER OXIDES
CRITICAL CURRENT
HIGH-TC SUPERCONDUCTORS
SUPERCONDUCTING FILMS
THALLIUM OXIDES
TRANSITION TEMPERATURE