[ital c]-axis response of YBa[sub 2]Cu[sub 4]O[sub 8]: A pseudogap and possibility of Josephson coupling of CuO[sub 2] planes

Journal Article · Mon Aug 01 04:00:00 EDT 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.50.3511· OSTI ID:7025063

Basov, D N; Timusk, T ^[1]; Dabrowski, B ^[2]; Jorgensen, J D ^[3]

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1. Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1 (Canada)
2. Department of Physics, Northern Illinois University, DeKalb, Illinois 60115 (United States)
3. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)

We report on the temperature dependence of the far-infrared conductivity of YBa[sub 2]Cu[sub 4]O[sub 8] single crystals for [bold E][parallel][ital c]. With decreasing temperature, the conductivity shows a transition from a Drude-like behavior to a pseudogap at 180 cm[sup [minus]1] which grows deeper below 180 K without any abrupt changes at the superconducting transition at [ital T][sub [ital c]]=80 K. In the superconducting state the formation of the superfluid condensate can be seen. We show that in a variety of high-[ital T][sub [ital c]] superconductors the value of the London penetration depth for [bold E][parallel][ital c] correlates with the conductivity along the [ital c] direction. With respect to this correlation we discuss the possibility of Josephson coupling between the CuO[sub 2] layers.

• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 7025063
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 50:5; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ALLOY SYSTEMS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ENERGY GAP
FAR INFRARED RADIATION
HIGH-TC SUPERCONDUCTORS
INFRARED RADIATION
JOSEPHSON EFFECT
OXIDES
OXYGEN COMPOUNDS
PENETRATION DEPTH
PHYSICAL PROPERTIES
QUATERNARY ALLOY SYSTEMS
RADIATIONS
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES