Phonon-mediated anisotropic superconductivity in the Y and Lu nickel borocarbides

Details Phonon-mediated anisotropic superconductivity in the Y and Lu nickel borocarbides Phonon-mediated anisotropic superconductivity in the Y and Lu nickel borocarbides

2002-09-19

arxiv.org/abs/cond-mat/0209469v1

Phys. Rev. B 67, 014526 (2003)

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures

Scientific paper

10.1103/PhysRevB.67.014526

We present scanning tunneling spectroscopy and microscopy measurements at low temperatures in the borocarbide materials RNi2B2C (R=Y, Lu). The characteristic strong coupling structure due to the pairing interaction is unambiguously resolved in the superconducting density of states. It is located at the superconducting gap plus the energy corresponding to a phonon mode identified in previous neutron scattering experiments. These measurements also show that this mode is coupled to the electrons through a highly anisotropic electron-phonon interaction originated by a nesting feature of the Fermi surface. Our experiments, from which we can extract a large electron-phonon coupling parameter lambda (between 0.5 and 0.8), demonstrate that this anisotropic electron-phonon coupling has an essential contribution to the pairing interaction. The tunneling spectra show an anisotropic s-wave superconducting gap function.

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