‘Giant’ normal state magnetoresistances of Bi $\mathsf{_{2}}$ Sr $\mathsf{_{2}}$ CaCu $\mathsf{_{2}}$ O $\mathsf{_{8 + \delta}}$

V. Zavaritsky, J. Vanacken, V. Moshchalkov and A. Alexandrov ()

The European Physical Journal B: Condensed Matter and Complex Systems, 2004, vol. 42, issue 3, 367-371

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. Copyright Springer-Verlag Berlin/Heidelberg 2004

Date: 2004
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DOI: 10.1140/epjb/e2004-00392-5

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