Superconducting energy gap in Bi[sub 1. 8]Pb[sub 0. 4]Sr[sub 2]Ca[sub 2]Cu[sub 3]O[sub 10+[delta]] studied by photoemission spectroscopy
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States) University of Illinois-Chicago, P.O. Box 4348, Chicago, Illinois 60680 (United States)
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
- Energy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
We report photoemission measurements on highly textured polycrystalline samples of Bi[sub 1.8]Pb[sub 0.4]Sr[sub 2]Ca[sub 2]Cu[sub 3]O[sub 10+[delta]] (Bi-2223, [ital T][sub [ital c]]=104 K). High-resolution data show a superconducting gap opening below [ital T][sub [ital c]]. The gap-spectrum line shape suggests an anisotropic gap structure in the Brillouin zone. The maximum gap in Bi-2223 is estimated to be 29 meV so that 2[Delta]/[ital kT][sub [ital c]][similar to]6.5, somewhat larger than the reduced gap in Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub 8] (Bi-2212). A spectral dip feature is observed at 72 meV in the superconducting state. The results are compared with angle-resolved experiments on Bi-2212 single crystals.
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6740422
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 51:2; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
ELECTRONIC STRUCTURE
EMISSION
ENERGY GAP
HIGH-TC SUPERCONDUCTORS
LEAD COMPOUNDS
LEAD OXIDES
OXIDES
OXYGEN COMPOUNDS
PHOTOEMISSION
POLYCRYSTALS
SECONDARY EMISSION
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TEXTURE
TRANSITION ELEMENT COMPOUNDS