The Influence of Adsorbed Radical Molecules Magnetic Moment on Superconducting Properties of Yttrium HTSC Ceramics
21st International Conference on Low Temperature Physics
08-14 Aug 1996
Czechoslovak Journal of Physics
, E-ISSN: 1572-9486
Number: Suppl., Pt. S3,
Boreskov Institute of Catalysis, Pr. Akademika Lavrentieva 5 Novosibirsk 630090, Russia
In the given work the magnetic susceptibility of yttrium ceramics was studied before and after adsorption on its surface nitroxyl radical TEMPO. It appears that in the presence of adsorbed radical the temperature dependence of the real part of magnetic susceptibility is changed in relation to the temperature down to which the sample was cooled. Such a behaviour is caused by the redistribution of magnetic field in intergranular interlayers improving thus critical parameters of intergranular bonds. Hence, the observed increase of critical current after TEMPO radical adsorption is more likely to be connected with radical magnetic moment than with its donor-acceptor properties.