High-Field Quasiparticle Tunneling in Bi2Sr2CaCu2O8+delta: Negative Magnetoresistance in the Superconducting State
Abstract
We report on the c-axis resistivity rhoc(H) in Bi2Sr2CaCu2O8+δ that peaks in quasi-static magnetic fields up to 60 T. By suppressing the Josephson part of the two-channel (Cooper pair/quasiparticle) conductivity σc (H), we find that the negative slope of c(H) above the peak is due to quasiparticle tunneling conductivity σq(H) across the CuO2 layers below Hc2. At high fields (a) σq(H) grows linearly with H, and (b) c(T) tends to saturate (sigmac ≠ 0) as T->0, consistent with the scattering at the nodes of the d-gap. A superlinear sigmaq(H) marks the normal state above Tc.
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