Tunneling measurement of the energy gaps in the superconductors Y-Ba-Cu-O and Tl-Ba-Ca-Cu-O

Journal Article · Fri Dec 01 04:00:00 EST 1989 · Physical Review (Section) B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.40.10954· OSTI ID:5067641

Lanping, Wang; Jian, He; Guowen, Wang ^[1]

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1. Physics Department, Peking University, Beijing, China (CN)

Reported here are the results of point-contact electron-tunneling measurements in the high-{ital T}{sub {ital c}} superconductors YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} and Tl{sub 2}Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub 10+{delta}}. The ratio 2{Delta}/{ital kT}{sub {ital c}} is 4.0--5.8 (probability maximum near 4.8) for Y-Ba-Cu-O and 4.6 for Tl-Ba-Ca-Cu-O. Both are consistent with strong-coupling superconductivity. The measurements at 600 different locations of the same sample of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} were performed. The energy distribution of energy gaps with the regularity of the ratio 1:3:5 reported by Kirk {ital et} {ital al}. have not been seen in our experiment.

• OSTI ID: 5067641
• Journal Information: Physical Review (Section) B: Condensed Matter; (USA), Journal Name: Physical Review (Section) B: Condensed Matter; (USA) Vol. 40:16; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

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
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DATA
ELECTRIC CONTACTS
ELECTRICAL EQUIPMENT
ENERGY GAP
EQUIPMENT
EXPERIMENTAL DATA
INFORMATION
MATHEMATICAL MODELS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PARTICLE MODELS
STRONG-COUPLING MODEL
THALLIUM COMPOUNDS
THALLIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TUNNEL EFFECT
YTTRIUM COMPOUNDS
YTTRIUM OXIDES