Anisotropic transport and cation disorder in superconducting Tl sub 2 Ca sub 2 Ba sub 2 Cu sub 3 O sub x single crystals

Journal Article · Mon Jul 30 04:00:00 EDT 1990 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.104243· OSTI ID:6549532

Tigges, C P; Venturini, E L; Kwak, J F; Morosin, B; Baughman, R J; Ginley, D S ^[1]

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1. Sandia National Laboratories, Org. 1144, Albuquerque, New Mexico 87185 (USA)

We have measured for the first time the temperature-dependent anisotropic resistivity of several Tl{sub 2}Ca{sub 2}Ba{sub 2}Cu{sub 3}O{sub {ital x}} single crystals. The resistivity ratio between the {ital c} axis and the {ital a}-{ital b} plane orientations in the best crystals is approximately 60 at room temperature. Resistivity data indicate substantial differences in both {Tc} and the transition width of nominal Tl{sub 2}Ca{sub 2}Ba{sub 2}Cu{sub 3}O{sub {ital x}} plates grown from two different melt compositions. A Tl-O and CuO-rich flux yielded approximately stoichiometric plates with sharp transitions beginning near 113 K, while a Tl-O-rich flux produced plates containing more Tl and less Ba with broad transitions starting near 103 K. These data demonstrate the extreme sensitivity of the superconductivity to cation site disorder in the Tl-Ca-Ba-Cu-O system.

• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6549532
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 57:5; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

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36 MATERIALS SCIENCE
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ANISOTROPY
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
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OXIDES
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PHYSICAL PROPERTIES
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STOICHIOMETRY
SUPERCONDUCTIVITY
THALLIUM COMPOUNDS
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THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
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