Evidence of strong electron-phonon interaction in superconducting MgB2 from electron tunneling
A. I. D'yachenko, V. Yu. Tarenkov, A. V. Abal'oshev, S. J. Lewandowski
Abstract
We report tunneling measurements of the electron-phonon (e-ph) interaction in superconducting MgB2 using the MgB2-I-Nb junctions, where I stands for insulator. The phonon structure in tunneling density of states in MgB2 clearly indicates strong e-ph coupling for the E2g in-plane boron phonons in a narrow range around 60 meV. The Eliashberg spectral function α2(ω)F(ω) reconstructed from the tunneling data, exhibits significant additional contribution into e-ph interaction from other vibrations such as acoustic ( 38 meV) and optical ( 90 meV) bands. Our results are in reasonable agreement with neutron scattering experiments, and also to some data of Raman and infrared spectroscopy.
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