Point-contact tunneling study of HgBa[sub 2]CuO[sub 4+[delta]]: BCS-like gap structure

Journal Article · Tue Feb 01 04:00:00 EST 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.49.3683· OSTI ID:5292128

Chen, Jun; Zasadzinski, J F; Gray, K E; Wagner, J L; Hinks, D G ^[1]

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1. Materials Science Division and Science and Technology Center for Superconductivity, Argonne National Laboratory, Argonne, Illinois 60439 (United States)

We report on point-contact tunneling into polycrystalline HgBa[sub 2]CuO[sub 4+[delta]] superconductors with a [ital T][sub [ital c]] onset of 97 K. Tunneling data follow the general trend of the best curves seen in cuprate high-temperature superconductors, but these show significantly [ital lower] and [ital flatter] subgap conductance values than any other cuprate and they can be reproducibly obtained. By fitting the data to a smeared BCS density of states, the energy gap has been determined and the smearing parameter is so small that it is comparable to thermal smearing.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5292128
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 49:5; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BCS THEORY
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL TEMPERATURE
CRYSTALS
ENERGY GAP
ENERGY-LEVEL DENSITY
HIGH-TC SUPERCONDUCTORS
MERCURY COMPOUNDS
MERCURY OXIDES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POLYCRYSTALS
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
TUNNEL EFFECT