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$_{7}$

Y. Yamato; M. Matsukawa; R. Suryanarayanan; S. Nimori; M. Apostu; A. Revcolevschi; K. Koyama; N. Kobayashi

doi:10.1063/1.3095598

paper

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 $_{7}$

arXiv:0812.2530 · doi:10.1063/1.3095598

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

Colossal electroresistance and colossal magnetoresistive step in paramagnetic insulating phase of single crystalline bilayered manganite(La0.4​Pr0.6​)1.2​Sr1.8​Mn2​O7​

Abstract

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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 $_{7}$