Electric-pulse-induced resistance switching effect in the bulk of La0.5Ca0.5MnO3 ceramics

M L Wu,R L Wang,H B Xiao,K Baerner,D W Shi,L F Xu,C P Yang

doi:10.1063/1.4872216

Abstract

In the majority of contributions, the electrical–pulse-induced resistance (EPIR) switching effect of perovskite manganites is thought to originate from the extrinsic interfacial Schottky barrier between the metal electrode and the surface of sample. In this work, La0.5Ca0.5MnO3 (LCMO) ceramic samples were synthesized by solid state reaction and the transport properties, especially, the EPIR effect and memristor behavior were investigated under 4-wire method using silver-glue as electrodes. Although the I-V characteristic of LCMO shows an ohmic linearity under the 4-wire mode at room temperature, a stable and remarkable EPIR can still be observed when the pulse voltage is more than a critical value. This bulk EPIR effect is novel for rare - earth doped manganites.

Highlights

La0.5Ca0.5MnO3 (LCMO) ceramic samples were synthesized by solid state reaction and the transport properties, especially, the electrical–pulse-induced resistance (EPIR) effect and memristor behavior were investigated under 4-wire method using silver-glue as electrodes
The I-V characteristic of LCMO shows an ohmic linearity under the 4-wire mode at room temperature, a stable and remarkable EPIR can still be observed when the pulse voltage is more than a critical value
La0.5Ca0.5MnO3 (LCMO) ceramic samples were synthesized by solid state reaction and the transport properties, especially the EPIR effect were investigated using 4-wire measurement mode

Summary

INTRODUCTION

Perovskite manganese oxide is a strongly correlated electron system and has attracted intensive attentions due to its rich and unique physical features, such as colossal magnetoresistance effect (CMR), spin - orbit - charge order, 100% spin polarization and intrinsic electronic phase separation.[1,2] In addition to the well-known unusual electrical and magnetic properties, the electric-pulse-induced resistance (EPIR) switching effect, which is connected with the colossal electroresistance and memristor behavior, is one of the interesting novel exotic phenomena in manganites.[3,4]. No model mentioned above can explain all the details of the EPIR effect and memristor behavior of perovskite manganites, and there are even experimentally contradictions between different research groups for the same compound, suggesting extrinsic causes.[21] In this work, La0.5Ca0.5MnO3 (LCMO) ceramic samples were synthesized by solid state reaction and the transport properties, especially the EPIR effect were investigated using 4-wire measurement mode. The I-V curve of LCMO shows an ohmic linearity under the 4-wire mode at room temperature, a stable and remarkable EPIR effect can still be observed when the voltage of the electrical pulse is more than a threshold value. We think that this bulk EPIR is a novel effect for rare - earth doped manganites

EXPERIMENT AND SAMPLE CHARACTERIZATION

AND DISCUSSION

CONCLUSION