STM investigation of the superconducting state of BSCCO 2212 and borocarbide materials

Conference · Wed Oct 01 04:00:00 EDT 1997

OSTI ID:539887

Iavarone, M ^[1]; Guptasarma, P; Hinks, D G ^[2]

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1. Argonne National Lab., IL (United States)
2. Argonne National Lab., IL (United States); and others

We present spectroscopic Scanning Tunneling Microscope (STM) measurements performed at 4.2 K on BSCCO 2212 single crystals and Y, Lu and Er based borocarbide compounds. The conductance versus voltage spectra on BSCCO 2212 reveal a reproducible dip feature near e{vert_bar}V{vert_bar} = 2{Delta}, for both voltage polarities pointing to a strong coupling origin of the feature. The conductance spectra obtained on YNi{sub 2}B{sub 2}C thin films and LuNi{sub 2}B{sub 2}C single crystals are similar and correspond to a BCS ratio of 3.2 indicating weak coupling superconductivity in these compounds. On Er Ni{sub 2}B{sub 2}C single crystals, the conductance spectra show a pronounced broadening compared to the spectra obtained on LuNi{sub 2}B{sub 2}C and YNi{sub 2}B{sub 2}C, which is attributed to the pair-breaking effect due to the Er magnetic ions.

• Research Organization: Argonne National Lab., IL (United States); Ames Lab., IA (United States)
• Sponsoring Organization: National Science Foundation, Washington, DC (United States); USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38; W-7405-ENG-82
• OSTI ID: 539887
• Report Number(s): ANL/MSD/CP--94368; CONF-970959--; ON: DE98000294; CNN: Contract DMR91-20000
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
BORON CARBIDES
COPPER OXIDES
CRYSTALS
ERBIUM CARBIDES
LUTETIUM CARBIDES
NICKEL CARBIDES
SPECTRA
STRONTIUM OXIDES
SUPERCONDUCTIVITY
THIN FILMS
YTTRIUM CARBIDES