'Giant' normal state magnetoresistances of Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$

Abstract

Magnetoresistance (MR) of Bi-2212 single crystals with T${}_c$ $\approx 87-92K$ 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.

References in corpus (3)

• Nernst effect in poor conductors and the cuprate superconductors
• Hall effect and resistivity in underdoped cuprates
• Vorticity, phase stiffness and the cuprate phase diagram

Cited by in corpus (1)

• Bose-Einstein condensation of strongly correlated electrons and phonons in cuprate superconductors