Colossal electroresistance in ferromagnetic insulating state of single crystal Nd${}_0.7$Pb${}_0.3$MnO${}_3$

Abstract

Colossal electroresistance (CER) has been observed in the ferromagnetic insulating (FMI) state of a manganite. Notably, the CER in the FMI state occurs in the absence of magnetoresistance (MR). Measurements of electroresistance (ER) and current induced resistivity switching have been performed in the ferromagnetic insulating state of a single crystal manganite of composition Nd${}_0.7$Pb${}_0.3$MnO${}_3$ (NPMO30). The sample has a paramagnetic to ferromagnetic (Curie) transition temperature, Tc = 150 K and the ferromagnetic insulating state is realized for temperatures, T <~ 130 K. The colossal electroresistance, arising from a strongly nonlinear dependence of resistivity ($\rho$) on current density (j), attains a large value ($\approx 100$) in the ferromagnetic insulating state. The severity of this nonlinear behavior of resistivity at high current densities is progressively enhanced with decreasing temperature, resulting ultimately, in a regime of negative differential resistivity (NDR, d$\rho$/dj < 0) for temperatures <~ 25 K. Concomitant with the build-up of the ER however, is a collapse of the MR to a small value (< 20%) even in magnetic field, H = 7 T. This demonstrates that the mechanisms that give rise to ER and MR are effectively decoupled in the ferromagnetic insulating phase of manganites. We establish that, the behavior of ferromagnetic insulating phase is distinct from the ferromagnetic metallic (FMM) phase as well as the charge ordered insulating (COI) phase, which are the two commonly realized ground state phases of manganites.

arXiv comment24 pages (RevTeX4 preprint), 8 figures, submitted to PRB

References in corpus (10)

• Colossal electroresistance and electronic phase separation in mixed-valent manganites
• Theory of Insulator Metal Transition and Colossal Magnetoresistance in Doped Manganites
• Modelling colossal magnetoresistance manganites
• Charge Localization in Disordered Colossal-Magnetoresistance Manganites
• New Origin For Spin Current And Current-Induced Spin Precession In Magnetic Multilayers
• Non-linear conduction in charge-ordered Pr${}_{0.63}$ Ca${}_{0.37}$ MnO${}_3$ : Effect of magnetic fields
• Universal behavior of giant electroresistance in epitaxial La0.67Ca0.33MnO3 thin films
• Insulator-Metal Phase Diagram of the Optimally Doped Manganites from the Disordered Holstein-Double Exchange Model
• Magnetic Field resulting from non-linear electrical transport in single crystals of charge-ordered Pr${}_{0.63}$ Ca${}_{0.37}$ MnO${}_3$}
• Non-linear electrical conduction and broadband noise in charge-ordered rare earth manganate Nd_0.5Ca_0.5MnO_3

Cited by in corpus (3)

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• Non-Gaussian resistance noise in the ferromagnetic insulating state of a hole doped manganite
• Metal-insulator transition and electroresistance in lanthanum/calcium manganites La_<1-x>Ca_<x>MnO_<3> (x = 0-0.5) from voltage-current-temperature surfaces