Superconductivity and phonon spectrum of the bismuth–thallium system

Electron tunneling in Bi–Tl films (55−90 at.% Bi) at pressures up to 12 kbar is studied experimentally. For component concentrations near that of Bi2Tl, the tunnel conductivity, which corresponds to the low-energy portion of the Bi–Tl phonon spectrum, reveals features that disappear at pressures P ≥ 3.5 kbar. These data demonstrate that there is a phonon instability near the phase equilibrium boundaries. Based on experimental data, the electron–phonon interaction functions α2(ω)F(ω) are reconstructed and on their basis changes observed in superconducting properties are analyzed.

Hali tarjima qilinmagan