Search for E_2g phonon modes in MgB_2 single crystals by point-contact spectroscopy

Details Search for E_2g phonon modes in MgB_2 single crystals by point-contact spectroscopy Search for E_2g phonon modes in MgB_2 single crystals by point-contact spectroscopy

2002-11-07

arxiv.org/abs/cond-mat/0211134v1

Phys. Rev. Lett. 2003, V.90, N19, p.197001.

Physics

Condensed Matter

Superconductivity

4 pages incl. 4 figs., RevTex4

Scientific paper

10.1103/PhysRevLett.90.197001

The electron-phonon interaction in magnesium diboride MgB_2 single crystals is investigated by point-contact (PC) spectroscopy. For the first time the electron coupling with E_2g phonon modes is resolved in the PC spectra. The correlation between intensity of the extremely broad E_2g modes in the PC spectra and value of the superconducting gap is established. Our observations favor current theoretical models for electron-phonon mediated superconductivity in MgB_2 and they better match the harmonic phonons model.

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