The evolution of magnetotransport properties with carrier concentration in Ca3Co4O9+δ single crystals

被引：15
作者：
Luo, XG [1 ]
Chen, XH
Wang, GY
Wang, CH
Xiong, YM
Song, HB
Lu, XX
机构：
[1] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China
[2] Univ Sci & Technol China, Dept Phys, Hefei 230026, Anhui, Peoples R China
来源：
EUROPHYSICS LETTERS | 2006年 / 74卷 / 03期
关键词：
D O I：
10.1209/epl/i2006-10011-3
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Magnetotransport properties are systematically investigated on Ca3Co4O9+d delta single crystals with different carrier concentrations changed by oxygen content. The in-plane resistivity decreases rapidly with increasing carrier concentration. Large negative magnetoresistance was observed in all the single crystals. A magnetic-field-driven sign change of the slope in resistivity at 25K and a magnetic-dependent energy gap in the range 20-60K are observed in highly doped crystals, while they are absent in the crystals with low carrier concentrations. In addition, a thermally activated resistivity induced by magnetic fields was observed at low temperatures below 12K in highly doped crystals. It is concluded that the magnetotransport properties are quite sensitive to the carrier concentration.
引用
收藏
页码：526 / 532
页数：7
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