Anisotropic resistivity and paraconductivity of Tl sub 2 Ba sub 2 CaCu sub 2 O sub 8 single crystals

Journal Article · Sat Jun 01 00:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.12925· OSTI ID:5622889

Duan, H M ^[1]; Kiehl, W ^[2]; Dong, C ^[1]; Cordes, A W ^[3]; Saeed, M J; Viar, D L ^[2]; Hermann, A M ^[1]

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1. Physics Department, University of Colorado, Boulder, Colorado 80309 (USA)
2. Physics Department, University of Arkansas, Fayetteville, Arkansas 72701 (USA)
3. Chemistry Department, University of Arkansas, Fayetteville, Arkansas 72701 (USA)

The anisotropic resistivity and paraconductivity of Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub 8} single crystals were measured. The in-plane and {ital c}-axis resistivities are, respectively, {similar to}7{times}10{sup {minus}4} and 10{sup {minus}1} {Omega} cm at room temperature. The {ital c}-axis resistivity decreases with decreasing temperature in the temperature range from room temperature down to the superconducting transition temperature, and the second derivative of {rho}{sub {ital c}} is negative, which is not characteristic of YBa{sub 2}Cu{sub 3}O{sub 7} and Bi{sub 2}Sr{sub 2.2}Ca{sub 0.8}Cu{sub 2}O{sub 8} single crystals, in which the second derivative is either positive or zero. The in-plane paraconductivity is obtained from the in-plane resistivity, and a method without the critical temperature as an adjustable parameter is employed to obtain the dimensionality. The data show that the superconductivity is two dimensional, but a crossover from two to three dimensions has also been observed near the transition temperature in some samples.

• OSTI ID: 5622889
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:16; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

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