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

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• Observation of particle hole asymmetry and phonon excitations in non-Fermi liquid systems: A high-resolution photoemission study of ruthenates
• Advances in point-contact spectroscopy: two-band superconductor MgB2 (A review)
• Multiple Andreev reflections spectroscopy of two-gap 1111- and 11 Fe-based superconductors
• Search for E_2g phonon modes in MgB_2 single crystals by point-contact spectroscopy
• Temperature Dependence of Superconducting Gaps in Mg(Al)B2 System Investigated by SnS-Andreev Spectroscopy
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• Investigation of LiFeAs by means of "Break-junction" Technique
• Reconstruction of the electron-phonon interaction function in Ta, 2H-NbSe2 and MgB2 from spectra of S - c - N point-contacts
• Intrinsic Multiple Andreev Reflections in layered Th-doped Sm${}_{1-x}$Th${}_x$OFeAs
• Study of the Two-Gap Superconductivity in GdO(F)FeAs by ScS-Andreev Spectroscopy