https://doi.org/10.1007/s100510070025
Evidence of critical fluctuations from the magnetoconductivity data in Bi2Sr2Ca2Cu3O10+x phase
1
Department of Theoretical Physics, Moscow State Institute of
Steel and Alloys, 117936 Moscow, Russia
2
INFM, II Universita di Roma "Tor Vergata", via Tor Vergata,
00133 Rome, Italy
3
INFM/CNR Dipartimento di Fisica, Universita di Genova, via
Dodecaneso 33, 16146 Genova, Italy
Corresponding author: a varlamov@ing-uniroma2.it
Received:
14
April
2000
Revised:
13
July
2000
Published online: 15 December 2000
The fluctuation-induced magnetoconductivity of the Bi2Sr2Ca2Cu3O10+x phase is studied above zero-field critical temperature
and for moderate magnetic fields. It is found that the Gaussian
approximation for superconducting fluctuations underestimates the negative
fluctuation magnetoconductance drastically in the 
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.
PACS: 74.25.Fy – Transport properties (electric and thermal conductivity, thermoelectric effects, etc.) / 74.40.+k – Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.) / 74.72.Hs – Bi-based cuprates / 74.76.Bz – High-Tc films
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000
