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- Title
STUDY OF THE ELECTRON-PHONON INTERACTION IN METAL DIBORIDES McB[sub2] (Mc = Zr, Nb, Ta, Mg) BY POINT-CONTACT SPECTROSCOPY.
- Authors
Yanson, I.K.; Naidyuk, Yu. G.; Kvitnitskaya, O.E.; Fisun, V.V.; Bobrov, N.L.; Chubov, P.N.; Ryabovol, V.V.; Behr, G.; Kang, W.N.; Choi, E.-M.; Kim, H.-J.; Lee, S.-I.; Aizawa, T.; Otani, S.; Drechsler, S.-L.
- Abstract
We review investigations of the electron-phonon interaction (EPI) in metal diborides MeB[sub 2] (Me = Zr, Nb, Ta, Mg) by point-contact (PC) spectroscopy. For transition metal compounds the PC EPI functions were recovered and EPI parameter λ ... 0.1 were estimated. The data are consistent with the measured surface phonon dispersion curves. The low λ value questions some reports about superconductivity in these compounds. Contrary, EPI in superconducting MgB[sub 2] films manifests also in the PC spectra itself by virtue of an elastic EPI contribution to the excess current determined by the energy dependence of the superconducting order parameter. To analyse the phonon features in the PC spectra of MgB[sub 2] a two-band model is exploited and the proximity effect in the k-space is suggested.
- Subjects
ELECTRON-phonon interactions; SPECTRUM analysis
- Publication
Modern Physics Letters B, 2003, Vol 17, Issue 10-12, p657
- ISSN
0217-9849
- Publication type
Article
- DOI
10.1142/S0217984903005688