https://doi.org/10.1140/epjb/e2004-00392-5
`Giant' normal state magnetoresistances of Bi2Sr2CaCu2O8+δ
1
Department of Physics, Loughborough University, Loughborough, UK
2
Kapitza Institute for Physical Problems, Moscow, Russia
3
Laboratory for Solid State Physics and Magnetism K.U. Leuven, Leuven, Belgium
Corresponding author: a a.s.alexandrov@lboro.ac.uk
Received:
7
September
2004
Published online:
23
December
2004
Magnetoresistance (MR) of Bi-2212 single crystals with 
K is studied in pulsed magnetic fields up to 50 T along the c-axis in a wide temperature range. The negative out-of-plane and the positive in-plane MRs are measured in the normal state. Both MRs have similar magnitudes, exceeding any orbital contribution by two orders in magnitude. These are explained as a result of the magnetic pair-breaking of preformed pairs. Resistive upper critical fields 
determined from the in– and out-of-plane MRs are about the same. They show non-BCS temperature dependences compatible with the Bose-Einstein condensation field of preformed charged bosons.
PACS: 74.72.Hs – Bi-based cuprates / 74.25.Fy – Transport properties (electric and thermal conductivity, thermoelectric effects, etc.) / 74.25.Op – Mixed states, critical fields, and surface sheaths / 74.20.Mn – Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.)
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2004
