Physics – Condensed Matter – Superconductivity
Scientific paper
2002-12-26
Modern Physics Letters B, Vol. 17, Nos. 10-12 (2003) 657-666
Physics
Condensed Matter
Superconductivity
6 pages, 6 figs., prepared for proceedings of conference "Modern Problem in Superconductivity", Sept. 2002, Yalta, Ukraine
Scientific paper
10.1142/S0217984903005688
We review investigations of the electron-phonon interaction (EPI) in metal diborides MeB_2 (Me=Zr, Nb, Ta, Mg) by point-contact (PC) spectroscopy. For transition metal compounds the PC EPI functions were recovered and EPI parameter $\lambda\lesssim 0.1$ were estimated. The data are consistent with the measured surface phonon dispersion curves. The low $\lambda$ value questions some reports about superconductivity in these compounds. Contrary, EPI in superconducting MgB_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$_2$ a two-band model is exploited and the proximity effect in the {\bf k}-space is suggested.
Aizawa T.
Behr Günter
Bobrov N. L.
Choi Eun-Mi
Chubov P. N.
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