High-temperature superconductivity in chalcogenide vitreous semiconductors

Relevant experimental data are discussed and the possibility is revealed of the occurrence of high-temperature superconductivity in vitreous Se in samples having the Form of globules of the well-known high-temperature superconductor Y1Ba2Cu3O7 embedded in vitreous Se. The possible superconducting state occurs in Se channels several micrometers long, appearing between Y1Ba2Cu3O7 globules as a result of switching. The parameters of the Se channels, determined for the normal and possible superconducting states, are in good agree ment with the values predicted by the model of negative-U centers. (C) 2001 MAIK "Nauka/Interperiodica".