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We analyzed the in-plane and out-of-plane magnetoresistance (MR) foroverdoped Bi$_{1.6}$Pb$_{0.4}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta}$ (Bi-2212) singlecrystals using superconductive fluctuation theory, which considers thedensity-of-states (DOS) contribution in layered superconductors with theconventional s-wave pairing state. The out-of-plane results are well reproducedby the theory, implying that the large, negative out-of-plane MR as well as thesharp increase in the zero-field out-of-plane resistivity $\rho_{c}$ near thesuperconducting transition temperature $T_c$ originate from the superconductiveDOS fluctuation effect. On the other hand, the in-plane results are betterreproduced without the DOS contribution (i.e., using only the Aslamazov-Larkin(AL) contribution), which may be explained in terms of the d-wavesuperconductivity of the layered superconductors.

Density-of-states fluctuation-induced negative out-of-plane magnetoresistance in overdoped Bi-2212