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Energy gaps in Bi-Sr-Ca-Cu-O and Bi-Sr-Cu-O systems by electron tunneling

Journal Article · · Physical Review (Section) B: Condensed Matter; (USA)
;  [1]
  1. Department of Physics, Aoyama-Gakuin University, 6-16-1 Chitosedai, Setagaya, Tokyo 157, Japan (JP)
+ Show Author Affiliations

We report the results of electron tunneling studies of the Bi-Sr-Ca-Cu-O and Bi-Sr-Cu-O systems by using point-contact tunneling. In these studies, we observed two distinctive energy gaps at each Bi-Sr-Ca-Cu-O system, having extremely large values. The larger values of the ratios 2{Delta}/{ital kT}{sub {ital c}} are 10--12 for Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub {ital y}} and 9--11 for Bi{sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}Oi{sub {ital y}} and the smaller values are 5.5--6.1 for Bi{sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub {ital y}}. These differences can be attributed to the gap anisotropies and the ratios of gaps are 1.7--1.8 for Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub {ital y}} and 1.5--1.8 for Bi{sub 2}Sr{sub 2}Ca{sub 2}C{sub 3}O{sub {ital y}}. The ratio 2{Delta}/{ital kT}{sub {ital c}} in the Ca-absent material Bi{sub 2}Sr{sub 2}CuO{sub {ital y}} was obtained as 5.4--7.4. The gap values are quite reproducible for the bulk, single crystal, and thin films.

OSTI ID:
5375211
Journal Information:
Physical Review (Section) B: Condensed Matter; (USA), Journal Name: Physical Review (Section) B: Condensed Matter; (USA) Vol. 40:10; ISSN PRBMD; ISSN 0163-1829
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY GAP
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS
TUNNEL EFFECT