The fluxuation-induced magnetoconductivity of the Bi2Sr2Ca2Cu3O10+x phase is studied above zero-field critical temperature T-c(0) and for moderate magnetic fields. It is found that the Gaussian approximation for superconducting fluctuations underestimates the negative fluctuation magnetoconductance drastically in the T-c(0) < T < T-c(0) + 20 K temperature range. Taking into account the critical fluctuation contribution on the base of self-consistent Hartree approximation makes it possible to explain the data quantitatively in terms of the only Aslamazov-Larkin contribution for different magnetic fields and temperatures consistently with the zero field data.
Evidence of critical fluctuations from the magnetoconductivity data in Bi2Sr2Ca2Cu3O10+x phase
PUTTI, MARINA;
2000-01-01
Abstract
The fluxuation-induced magnetoconductivity of the Bi2Sr2Ca2Cu3O10+x phase is studied above zero-field critical temperature T-c(0) and for moderate magnetic fields. It is found that the Gaussian approximation for superconducting fluctuations underestimates the negative fluctuation magnetoconductance drastically in the T-c(0) < T < T-c(0) + 20 K temperature range. Taking into account the critical fluctuation contribution on the base of self-consistent Hartree approximation makes it possible to explain the data quantitatively in terms of the only Aslamazov-Larkin contribution for different magnetic fields and temperatures consistently with the zero field data.
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