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The electron-phonon interaction in magnesium diboride MgB_2 single crystalsis investigated by point-contact (PC) spectroscopy. For the first time theelectron coupling with E_2g phonon modes is resolved in the PC spectra. Thecorrelation between intensity of the extremely broad E_2g modes in the PCspectra and value of the superconducting gap is established. Our observationsfavor current theoretical models for electron-phonon mediated superconductivityin MgB_2 and they better match the harmonic phonons model.Comment: 4 pages incl. 4 figs., RevTex

physical review letters

Search for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>E</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mi>g</mml:mi></mml:mrow></mml:msub></mml:math>Phonon Modes in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow><mml:mi mathvariant="normal">M</mml:mi><mml:mi mathvariant="normal">g</mml:mi><mml:mi mathvariant="normal">B</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:math>Single Crystals by Point-…

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