Low temperature hopping in granular oxides La0.67Ca0.33MnO3 and La0.5Sr0.5CoO3

被引：0
|
作者：
Narjis, A. [1 ]
El Kaaouachi, A. [1 ]
Liang, C-T [2 ,3 ]
El Idrissi, H. [4 ]
Zatni, A. [4 ]
Tata, O. [1 ]
机构：
[1] Ibn Zohr Univ, Fac Sci, Equipe Semicond Nanotechnol & Programmat Sci, Res Grp,Phys Dept, BP 8106, Hay Dakhla 80000, Agadir, Morocco
[2] Sungkyunkwan Univ, Sch Elect & Elect Engn, Suwon 440746, South Korea
[3] Natl Taiwan Univ, Dept Phys, Taipei, Taiwan
[4] Univ Hassan II Mohammedia Casablanca, Fac Sci & Techn Mohammedia, EEA TI, Casablanca, Morocco
来源：
ADVANCES IN CRYOGENIC ENGINEERING, VOL 60 | 2014年 / 1574卷
关键词：
Granular materials; Variable range hopping; Negative magnetoresistance; Low temperature; CONDUCTIVITY; MAGNETORESISTANCE; METALS;
D O I：
10.1063/1.4860637
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
We studied electrical transport in La0.67Sr0.33MnO3 (LCMO) and La0.5Sr0.5CoO3 (LSCO) nanocrystals over a temperature range of 0.4 K <= T <= 5 K. In both samples, two distinct behaviors of the conductivity are observed. For T>1 K, the variable range hopping regime is observed in LCMO sample with enhancement of the relative permittivity. In contrast, this behavior is not consistent with the extracted parameters in LSCO sample. For T<1 K, the transport is believed to occur through the metallic droplets connected to the intergranular regions where the negative magnetoresistance is due to spin-polarized tunneling phenomenon.
引用
收藏
页码：286 / 290
页数：5
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