Evidence of critical fluctuations from the magnetoconductivity data in Bi2Sr2Ca2Cu3O10+x phase

The fluxuation-induced magnetoconductivity of the Bi2Sr2Ca2Cu3O10+x phase i s studied above zero-field critical temperature T-c(0) and for moderate mag netic fields. It is found that the Gaussian approximation for superconducti ng fluctuations underestimates the negative fluctuation magnetoconductance drastically in the T-c(0) < T < T-c(0) + 20 K temperature range. Taking int o account the critical fluctuation contribution on the base of self-consist ent Hartree approximation makes it possible to explain the data quantitativ ely in terms of the only Aslamazov-Larkin contribution for different magnet ic fields and temperatures consistently with the zero field data.