Colossal electroresistance and colossal magnetoresistive step in paramagnetic insulating phase of single crystalline bilayered manganite(La${}_{0.4}$Pr${}_{0.6}$)${}_{1.2}$Sr${}_{1.8}$Mn${}_2$O${}_7$

Abstract

We report a significant decrease in the low-temperature resistance induced by the application of an electric current on the $ab$-plane in the paramagnetic insulating (PMI) state of (La${}_{0.4}$Pr${}_{0.6}$)${}_{1.2}$Sr${}_{1.8}$Mn${}_2$O${}_7$. A colossal electroresistance effect attaining -95% is observed at lower temperatures. A colossal magnetoresistive step appears near 5T at low temperatures below 10K, accompanied by an ultrasharp width of the insulator-metal transition. Injection of higher currents to the crystal causes a disappearance of the steplike transition. These findings have a close relationship with the presence of the short-range charge-ordered clusters pinned within the PMI matrix of the crystal studied.

4 pages 3 figures

References in corpus (8)

• Ultra-sharp magnetization steps in perovskite manganites
• Charge melting and polaron collapse in $L{a}_{1.2}S{r}_{1.8}M{n}_2{O}_7$
• Glass Transition in the Polaron Dynamics of CMR Manganites
• Non-linear electrical response in a non-charge-ordered manganite: Pr0.8Ca0.2MnO3
• Dielectrophoresis model for the colossal electroresistance of phase-separated manganites
• Anisotropic phonon conduction and lattice distortions in CMR-type bilayer manganite (La${}_{1-z}$Pr${}_z$)${}_{1.2}$Sr${}_{1.8}$Mn${}_2$O${}_7$ (z=0,0.2,0.4 and 0.6) single crystals
• Resistive relaxation in field-induced insulator-metal transition of a (La${}_{0.4}$Pr${}_{0.6}$)${}_{1.2}$Sr${}_{1.8}$Mn${}_2$O${}_7$ bilayer manganite single crystal
• Steplike Lattice Deformation of Single Crystalline (La${}_{0.4}$Pr${}_{0.6}$)${}_{1.2}$Sr${}_{1.8}$Mn${}_2$O${}_7$ Bilayered Manganite