Electric and magnetic properties of La0.67Sr0.33MnO3 thin films with a metal-insulator crossover behavior

Electric and magnetic properties of La0.67Sr0.33MnO3 thin films with a metal-insulator crossover behavior
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具有金属-绝缘体交叉行为的 La0.67Sr0.33MnO3 薄膜的电学和磁学特性

DOI:
10.1063/1.4737783
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发表时间:
2012-07
影响因子:
3.2
通讯作者:
W.B. Wu
W.B. Wu
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Y. H. Sun, Y. G. Zhao, M. H. Zhu,;W.B. Wu

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研究了在LaAlO_3衬底上生长的10 nm厚的La0.67Sr0.33MnO_3薄膜的电磁性能。结构分析表明,薄膜的质量较高。随着温度的降低,样品的电阻率增加,在90K左右出现一个峰值,然后在30K左右出现一个最小值,表现出金属-绝缘体的交叉行为,这与较厚或较薄的薄膜的输运行为截然不同。电流和磁场都能明显降低材料的电阻率。在很小的电流下观察到显著的电阻,在低温下观察到很强的电阻滞后和交换偏置效应。从薄膜中压应变引起的相分离的角度对结果进行了讨论。
The electric and magnetic properties of 10 nm thick La0.67Sr0.33MnO3 films grown on LaAlO3 substrates have been investigated. Structural analysis shows the high quality of the films. With decreasing temperature, the resistivity of the samples increases and shows a peak at about 90 K, followed by a resistivity minimum at about 30 K, manifesting a metal-insulator crossover behavior, which is quite different from the transport behaviors of thicker or thinner films. Both electric current and magnetic field can distinctly reduce the resistivity. Remarkable electroresistance under very low currents, strong resistive hysteresis, and exchange bias effect are observed at low temperatures. The results are discussed in terms of phase separation induced by compressive strain in the films.
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