Colossal electroresistance of a Pr0.7Ca0.3MnO3 thin film at room temperature
Colossal electroresistance of a Pr0.7Ca0.3MnO3 thin film at room temperature
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DOI：
10.1103/physrevb.70.224403
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发表时间：
2004-12-01
影响因子：
3.7
通讯作者：
Adachi, H
中科院分区：
文献类型：
--
作者：
Odagawa, A;Sato, H;Adachi, H
研究了Pr0.7Ca0.3MnO3薄膜的电子传导特性。半导体Pr0.7Ca0.3MnO3薄膜夹在电极之间，其电流-电压特性表现出滞后和非对称性。所观察到的导电特性表现出空间电荷限制电流效应，和滞后行为可以归因于载流子捕获和陷阱位置的锰氧化物。滞后引起的巨大的电阻（CER）在室温下超过5000%。CER比是独立的脉冲的持续时间从无限（直流）下降到150 ns，表明载流子填充的所有陷阱可以在很短的时间内完成。
The electronic conduction through a Pr0.7Ca0.3MnO3 thin film is investigated by measurements using dc and pulsed biases. Semiconducting Pr0.7Ca0.3MnO3 films sandwiched by electrodes show both hysteretic and asymmetric behaviors in current-voltage characteristics. The observed conduction characteristics exhibit the space-charge-limited-current effect, and the hysteretic behavior can be ascribed to a carrier trapping and detrapping of the trap sites in the manganite. The hysteresis induces a colossal electroresistance (CER) of more than 5000% at room temperature. The CER ratio is independent of the duration time of pulses from an infinite (dc) down to 150 ns, indicating that the carrier filling of all the traps can be completed within a short time.