Origin of positive out-of-plane magnetoconductivity in overdoped Bi$_{1.6}$Pb$_{0.4}$Sr$_{2}$CaCu$_{1.96}$Fe$_{0.04}$O$_{8+\delta}$

TL;DR

This study investigates the positive out-of-plane magnetoconductivity in overdoped cuprates, revealing that both pseudogap and superconductive DOS depletion effects contribute, especially below the superconductive fluctuation regime.

Contribution

It provides new insights into the origin of positive out-of-plane magnetoconductivity by distinguishing the roles of pseudogap and superconductive DOS depletion effects in overdoped cuprates.

Findings

Superconductive DOS depletion effect appears below the fluctuation regime.

Both pseudogap and DOS depletion contribute to magnetoconductivity.

The DOS depletion effect dominates in the superconducting state.

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.