JETP Letters: issues online

$The transverse magnetoresistance of β(ET) 2IBr 2 single crystals has been studied in fields up to 150 kOe in the orientations H\\c* and Η \\b'. Shubnikov-de Haas oscillations have been observed at TS 4.2 К and Η ис* Ζ 80 kOe. A tunnelling-effect method has been used to study the superconducting characteristics of Eu)Ba2Cu307 single crystals. Ratios 2L/kTc = 10-11.6 have been found. The "phonon" structure on the curves of — d V/dI{ V) is compared with the phonon spectra of oxide superconductors. It is suggested that although the electron-phonon interaction is strong in E^Ba^^Oy, it can explain only 10-20% of the value of Tc. The temperature dependence of the rate at which electrons are trapped by donor centers causes the domain walls formed in the multivalued Sasaki effect to become layers of a concentration depletion or enrichment. The result is either a "self-localization" of the wall at the inhomogeneity which it itself creates (a sharp decrease in the mobility in a transverse magnetic field) or a spontaneous motion of the wall.$

The transverse magnetoresistance of β(ET) ₂IBr ₂ single crystals has been studied in fields up to 150 kOe in the orientations H\\c* and Η \\b'. Shubnikov-de Haas oscillations have been observed at TS 4.2 К and Η и_с* Ζ 80 kOe. A tunnelling-effect method has been used to study the superconducting characteristics of Eu₎Ba₂Cu₃0₇ single crystals. Ratios 2L/kT_c = 10-11.6 have been found. The "phonon" structure on the curves of — d V/dI{ V) is compared with the phonon spectra of oxide superconductors. It is suggested that although the electron-phonon interaction is strong in E^Ba^^Oy, it can explain only 10-20% of the value of T_c. The temperature dependence of the rate at which electrons are trapped by donor centers causes the domain walls formed in the multivalued Sasaki effect to become layers of a concentration depletion or enrichment. The result is either a "self-localization" of the wall at the inhomogeneity which it itself creates (a sharp decrease in the mobility in a transverse magnetic field) or a spontaneous motion of the wall.