Abstract.
Magnetoresistance (MR) of Bi-2212 single crystals with \(T_{c} \approx 87-92\) 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 H c2(T) 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.
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Received: 7 September 2004, Published online: 23 December 2004
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.)
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Zavaritsky, V.N., Vanacken, J., Moshchalkov, V.V. et al. ‘Giant’ normal state magnetoresistances of Bi\(\mathsf{_{2}}\)Sr\(\mathsf{_{2}}\)CaCu\(\mathsf{_{2}}\)O \(\mathsf{_{8 + \delta}}\) . Eur. Phys. J. B 42, 367–371 (2004). https://doi.org/10.1140/epjb/e2004-00392-5
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DOI: https://doi.org/10.1140/epjb/e2004-00392-5