Point-contact study of the LuNi2B2C borocarbide superconducting film

Details Point-contact study of the LuNi2B2C borocarbide superconducting film Point-contact study of the LuNi2B2C borocarbide superconducting film

2010-07-08

arxiv.org/abs/1007.1406v2

Supercond. Sci. Technol. 23 (2010) 115001 (5pp)

Physics

Condensed Matter

Superconductivity

5 pages, 5 figures, V2: figs. 2 & 5 captions are corrected, and new Refs. 4, 6, 12, 13, 14 are added

Scientific paper

10.1088/0953-2048/23/11/115001

We present point-contact (PC) Andreev-reflection measurements of a superconducting epitaxial c-axis oriented nickel borocarbide film LuNi2B2C (Tc=15.9 K). The averaged value of the superconducting gap is found to be 2.6 +/-0.2 meV in the one-gap approach, whereas the two-gap approach results in 2.14+/-0.36 meV and 3.0+/-0.27 meV. The better fit of the Andreev-reflection spectra for the LuNi2B2C - Cu PC obtained by the two-gap approach provides evidence for multiband superconductivity in LuNi2B2C. For the first time, PC electron-phonon interaction (EPI) spectra have been measured for this compound. They demonstrate pronounced phonon maximum at 8.5+/-0.4meV and a second shallow one at 15.8+/-0.6 meV. The electron-phonon coupling constant estimated from the PC EPI spectra turned out to be small (~ 0.1), like in other superconducting rare-earth nickel borocarbides. Possible reasons for this are discussed.

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