Phonon structure in I-V characteristic of MgB${}_2$ point-contacts

Abstract

The search of the phonon structure at the above-gap energies was carried out for $d^{2}V/d{I}^2(V)$ spectra of MgB${}_2$ point contacts with a normal metal. The two-band model is assumed not only for the gap structure in $dV/dI(V)$-characteristics, but also for phonons in $d^{2}V/d{I}^2(V)$ point-contact spectra, with up to the maximum lattice vibration energy. Since the current is carried mostly by charges of 3D-band, whereas the strong electron-phonon interaction occurs in 2D-band, we observe the phonon peculiarities due to ''proximity'' effect in {\it k}-space, which depends on the variation of interband coupling through the elastic scattering.

6 pages, 4 figures, revtex4, reported in International Conference "Modern Problems in Superconductivity", 9-13 September, Yalta, Ukraine

References in corpus (5)

• Two-gap superconductivity in MgB${}_2$: clean or dirty?
• Two-Band Superconductivity in MgB2
• Multiband model for tunneling in MgB2 junctions
• Evidence for Two-Band Superconductivity from Break Junction Tunneling on MgB2
• Superconducting energy gap distribution in c-axis oriented MgB${}_2$ thin film from point contact study

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