0308256.pdf (599.73 kB)
'Giant' normal state magnetoresistances of Bi2Sr2CaCu2O8+.
preprint
posted on 2006-04-03, 16:04 authored by V.N. Zavaritsky, J. Vanacken, V.V. Moshchalkov, A.S. AlexandrovMagnetoresistance (MR) of Bi-2212 single crystals with T$_{c}$ $\approx 87-92 K$ is studied in pulsed magnetic fields up to 50T 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.
History
School
- Science
Department
- Physics
Pages
614121 bytesPublication date
2003Notes
This is a pre-print. It is also available at: http://arxiv.org/abs/cond-mat/0308256.Language
- en