Conductivity and paraconductivity in (Bi,Pb)[sub 2]Sr[sub 2]Ca[sub [ital n][minus]1]Cu[sub [ital n]]O[sub [ital x]] whiskers

Journal Article · Thu Jul 01 04:00:00 EDT 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.48.1254· OSTI ID:6343482

Chen, X; Marone, M J; Tessema, G X; Skove, M J; Nevitt, M V ^[1]; Miller, D J; Veal, B W ^[2]

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1. Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634 (United States)
2. Argonne National Laboratory, Argonne, Illinois 60439 (United States)

We have measured the resistivity of (Bi,Pb)[sub 2]Sr[sub 2]Ca[sub [ital n][minus]1]Cu[sub [ital n]]O[sub [ital x]] single-crystal whiskers in the [ital a] and [ital c] directions. Our results indicate that the whiskers may be either 2:2:1:2 ([ital n]=1) or 2:2:2:3 ([ital n]=2) or have both phases present. Well above [ital T][sub [ital c]], the resistivity in the [ital a] direction decreases linearly with temperature. We also studied the paraconductivity due to thermal fluctuations above [ital T][sub [ital c]]. The paraconductivity in the [ital a] direction shows quasi-one-dimensional behavior for temperatures close to [ital T][sub [ital c]]. This quasi-one-dimensional behavior may be due to a percolative conduction path. For the [ital c] direction, the resistivity is best fit by [rho][sub [ital c]]=[ital Ae][sup [minus][ital E]][sub [ital g]]/[ital kT], where [ital T] is the temperature. However, as [ital T] approaches [ital T][sub [ital c]] from above, [rho][sub [ital c]] increases much faster than a thermally activated law, perhaps because of the fluctuations.

• OSTI ID: 6343482
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 48:2; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
ANISOTROPY
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FLUCTUATIONS
HIGH-TC SUPERCONDUCTORS
LEAD COMPOUNDS
LEAD OXIDES
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0065-0273 K
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
VARIATIONS
WHISKERS