Origin of positive out-of-plane magnetoconductivity in overdoped Bi${}_{1.6}$Pb${}_{0.4}$Sr${}_2$CaCu${}_{1.96}$Fe${}_{0.04}$O${}_{8+\delta }$

Abstract

To elucidate the pseudogap phase diagram including the overdoped state of high transition temperature (high-$T_c$) cuprates, we must understand the origin of the positive out-of-plane magnetoconductivity (MC) observed in these compounds. For this purpose, the out-of-plane resistivity ${\rho }_c(T,H)$ of an overdoped Bi${}_{1.6}$Pb${}_{0.4}$Sr${}_2$CaCu${}_{1.96}$Fe${}_{0.04}$O${}_{8+\delta }$ (Bi-2212) single crystal is measured under pulsed magnetic fields up to 60 T. We show that the superconductive density-of-states (DOS) depletion effect, in addition to the pseudogap effect, clearly appears below the superconductive fluctuation regime, and the contribution becomes dominant in the superconducting state.

arXiv comment6 pages, 5 figures

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• Incoherent-coherent crossover and the pseudogap in Te-annealed superconducting Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ revealed by magnetotransport measurements