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Tunneling spectroscopy of YBa/sub 2/Cu/sub 3/O/sub 6. 5+//sub x/ and Y/sub 0. 95/Al/sub 0. 05/Ba/sub 2/Cu/sub 3/O/sub 6. 5+//sub x/ with use of a scanning-tunneling microscope

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
; ; ;
We have made gap measurements at 4.2 K on the high-T/sub c/ superconductor YBa/sub 2/Cu/sub 3/O/sub 6.5+//sub x/ by electron tunneling using a low-temperature scanning-tunneling microscope. In all the samples studied we observe large variations in the energy gap. We observe a very sharp gap in all the samples with 2..delta.. = 5 meV yielding a value of 2..delta..k/sub B/T/sub c/ = 0.7, far below the weak-coupling limit. The largest gap we measure has a value of 2..delta.. = 95 meV and indicates an extremely strong coupling value of 2..delta..k/sub B/T/sub c/ = 13. The large gap may be due to tunneling between a series of superconducting regions within the sample. This possibility and other results are discussed in terms of tunneling into a glassy superconductor
Research Organization:
Department of Physics, The University of Alberta, Edmonton, Alberta, Canada T6Gchemically bond2J1
OSTI ID:
5220959
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 37:13; ISSN PRBMD
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
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DATA
DOPED MATERIALS
ELECTRON MICROSCOPY
ENERGY GAP
EXPERIMENTAL DATA
INFORMATION
MATERIALS
MICROSCOPY
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
SCANNING ELECTRON MICROSCOPY
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
ULTRALOW TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES